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Systems with external interactions
An open system is a system that has external interactions. Such interactions can take the form of information, energy, or material transfers into or out
Open_system_(systems_theory)
Topics referred to by the same term
Look up open system in Wiktionary, the free dictionary. Open system may refer to: Open system (computing), one of a class of computers and associated
Open_system
Quantum mechanical system that interacts with a quantum-mechanical environment
In physics, an open quantum system is a quantum mechanical system that interacts with an external quantum system, known as the environment or the bath
Open_quantum_system
Body of matter in a state of internal equilibrium
the environment, a thermodynamic system may be an isolated system, a closed system, or an open system. An isolated system does not exchange matter or energy
Thermodynamic_system
Reference model for network communication
The Open Systems Interconnection (OSI) model is a reference model developed by the International Organization for Standardization (ISO) that "provides
OSI_model
Prevalent ownership and land use structure in medieval agriculture
The open-field system was the prevalent agricultural system in much of Europe during the Middle Ages and lasted into the 20th century in Russia, Iran
Open-field_system
System calls in some operating systems
In Unix-like operating systems, a program initializes access to a file in a file system using the open system call. This allocates resources associated
Open_(system_call)
Organ system for circulating blood in animals
of blood vessels. Many invertebrates such as arthropods have an open circulatory system with a heart that pumps a hemolymph which returns via the body
Circulatory_system
Interrelated entities that form a whole
coherent entity"—otherwise they would be two or more distinct systems. Most systems are open systems, exchanging matter and energy with their respective surroundings;
System
Energy system models that are open source
Open energy-system models are energy-system models that are open source. Some may use third-party proprietary software as part of their workflows. These
Open_energy_system_models
Open systems are computer systems that provide some combination of interoperability, portability, and open software standards. (It can also refer to specific
Open_system_(computing)
International technology company
Automatic Systems International, Inc. (ASI), or Open Systems International (OSI) is an automation software company headquartered in Medina, Minnesota,
Open_Systems_International
Topics referred to by the same term
2009 memoir Open (process), a program launcher invoked from the command line in NeXTSTEP or Mac OS X Open (system call), standardized system call for opening
Open
Web syndication format
The Open Publication Distribution System (OPDS) catalog format is a syndication format for electronic publications based on the Readium Web Publication
Open Publication Distribution System
Open_Publication_Distribution_System
Voting method in which voters vote openly
open ballot system is a voting method in which voters vote openly, in contrast to a secret ballot, where a voter's choices are confidential. The open
Open_ballot_system
Law of thermodynamics establishing the conservation of energy
the open system, between its initial and final states of internal equilibrium. An open system can be in contact equilibrium with several other systems at
First_law_of_thermodynamics
Standard for archival system
The term Open Archival Information System (or OAIS) refers to the ISO OAIS Reference Model for an OAIS. This reference model is defined by recommendation
Open Archival Information System
Open_Archival_Information_System
Sound server for Unix-like operating systems
The Open Sound System (OSS) is an interface for making and capturing sound in Unix and Unix-like operating systems. It is based on standard Unix devices
Open_Sound_System
Asset portfolio of the US Federal Reserve
The System Open Market Account (SOMA) is a financial portfolio managed by the Federal Reserve Bank of New York that holds the assets it has purchased
System_Open_Market_Account
An open class system is the stratification that facilitates social mobility, with individual achievement and personal merit determining social rank. The
Open_class_system
Something that is simultaneously a whole and a part
sometimes discussed in the context of self-organizing holarchic open (SOHO) systems. The word holon (Ancient Greek: ὅλον) is a combination of the Greek
Holon_(philosophy)
Physical systems that don't interact with other parts of the universe
called a closed system, being enclosed by selective walls through which energy can pass as heat or work, but not matter; and with an open system, which both
Isolated_system
Energy-related datasets for open use
Open energy system database projects employ open data methods to collect, clean, and republish energy-related datasets for open use. The resulting information
Open_energy_system_databases
The Open Source Information System (OSIS) is the former name of an American unclassified network serving the U.S. intelligence community with open source
Open Source Information System
Open_Source_Information_System
System design objective
Open systems architecture is a system design approach which aims to produce systems that are inherently interoperable and connectable without recourse
Open_systems_architecture
Former open source software organization
Open Whisper Systems (OWS) was a software development group that was founded by Moxie Marlinspike in 2013. The group picked up the open source development
Open_Whisper_Systems
Macintosh multimedia software
Open Music System (OMS) was a virtual studio management application by Opcode for the Classic Mac OS. Similar to FreeMIDI by Mark of the Unicorn and Audio
Open_Music_System
These tables compare free software / open-source operating systems. Where not all of the versions support a feature, the first version which supports
Comparison of open-source operating systems
Comparison_of_open-source_operating_systems
Journal management and publishing system
Open Journal Systems, also known as OJS, is an open source and free software for the management of peer-reviewed academic journals, created by the Public
Open_Journal_Systems
The Polytechnic University of the Philippines Open University System is the nontraditional/distance studies unit of the Polytechnic University of the Philippines
PUP_Open_University_System
Collection of co-operating systems
Dependable Evolutionary Open System-of-Systems) aiming to bring time awareness and evolution into the design of System-of- Systems (SoS) with possible emergent
System_of_systems
An open-source voting system (OSVS), also known as open-source voting (or OSV), is a voting system that uses open-source software (and/or hardware) that
Open-source_voting_system
Thermodynamically open system which is not in equilibrium
A dissipative system is a thermodynamically open system which is operating out of, and often far from, thermodynamic equilibrium in an environment with
Dissipative_system
Control paradigm in which errors are measured before they can affect a system
the system might receive. Neither open-loop control nor teleoperator systems require the sophistication of a mathematical model of the physical system or
Feed_forward_(control)
The Open Systems Adapter (OSA) is a network controller for IBM z/Architecture, ES/9000 and S/390 mainframes. The OSA can be installed in a mainframe I/O
Open_Systems_Adapter
Type of system
time. Glossary of systems theory Dynamical system Isolated system Open system (systems theory) Sense and Respond Thermodynamic system Rana, N.C.; P.S.
Closed_system
Communication standards for smart meters
The open metering system of the Open Metering System Group e.V. stands for a manufacturer- and media-independent standardization for Meter-Bus (M-Bus)
Open_metering_system
Reference model for enterprise architecture
Open-system environment (OSE) reference model (RM) or OSE reference model (OSE/RM) is a 1990 reference model for enterprise architecture. It provides
Open-system environment reference model
Open-system_environment_reference_model
Business accounting software package
Open Systems Accounting Software (OSAS) is a business accounting software package for small- to medium-sized businesses using the Microsoft Windows, Linux
Open Systems Accounting Software
Open_Systems_Accounting_Software
Open System Tribology is a field of tribology that studies tribological systems that are exposed to and affected by the natural environment. Factors influencing
Open_system_tribology
System of enforceable rules
ways and also serves as a mediator of relations between people. Legal systems vary between jurisdictions, with their differences analysed in comparative
Law
System of multiple interacting agents
multi-agent system (MAS) or "self-organized system" is a computational system composed of multiple interacting intelligent agents. Multi-agent systems can solve
Multi-agent_system
Family of computer operating systems
new industry consortium called The Open Group in 1993, allowing the use of the mark for certified operating systems that comply with the Single UNIX Specification
Unix
Role-playing game system
of the d20 System was released as the System Reference Document (SRD) under the Open Game License (OGL) as Open Game Content (OGC), which allows commercial
D20_System
Organ system of the genitals and the urinary tract
Because of this, the systems are sometimes imaged together. In placental mammals (including humans), the male urethra goes through and opens into the penis
Genitourinary_system
Academic journal
Open Systems & Information Dynamics (OSID) is a journal published by World Scientific. It covers interdisciplinary research in mathematics, physics, engineering
Open Systems & Information Dynamics
Open_Systems_&_Information_Dynamics
Educational software application
Record Store (LRS) List of learning management systems Massive open online course Student information system – Software for educational institutions to manage
Learning_management_system
Wunderlich. The brand's current range of instruments uses the Open-Architecture-System (OAS), which is a GUI that runs using a Windows XP computer, enabling
Wersi
Family of distributed open-source operating systems
OpenHarmony (OHOS, OH) is a family of open-source distributed operating systems sharing some principles from Huawei LiteOS lineage. Huawei donated the
OpenHarmony
Fundamental change in ideas and practices within a scientific discipline
not. Normal science does not mean at all a science guided by a coherent system of rules, on the contrary, the rules can be derived from the paradigms,
Paradigm_shift
1998 studio album by System of a Down
System of a Down is the debut studio album by the American heavy metal band System of a Down, released on June 30, 1998, by American Recordings and Columbia
System_of_a_Down_(album)
Free Unix-like operating system kernel
The Linux kernel is a free and open-source Unix-like kernel that is used in many computer systems worldwide. The kernel was created by Linus Torvalds in
Linux_kernel
Computer operating system
OpenVMS, often referred to as just VMS, is a multi-user, multiprocessing and virtual memory-based operating system. It is designed to support time-sharing
OpenVMS
The Open Architecture System Integration Strategy or OASIS Model was presented by Apple Computer as the philosophy behind the Mac in marketing beginning
Open Architecture System Integration Strategy
Open_Architecture_System_Integration_Strategy
Enterprise modeling framework
CIMOSA, standing for "Computer Integrated Manufacturing Open System Architecture", is an enterprise modeling framework, which aims to support the enterprise
CIMOSA
Software that manages computer hardware resources
code to open source operating systems; such operating systems have transparent change histories and distributed governance structures. Open source developers
Operating_system
Mainframe operating system (2008–2010)
OpenSolaris for System z is a discontinued port of the OpenSolaris operating system to the IBM System z line of mainframe computers. OpenSolaris is based
OpenSolaris_for_System_z
Points System: Points System: "Formula Euro Open Nissan - 1999: Entrylist". Speedsport Magazine. Retrieved 27 February 2024. "Formula Euro Open Nissan
1999_Euro_Open_by_Nissan
of spatial extensions to object-relational database management systems (also both open-source and commercial) created new opportunities for data storage
Geographic information system software
Geographic_information_system_software
Metropolitan Open Space System (D'MOSS) is a system of green corridors in the city of Durban, South Africa. Implemented in 1982, the system links a number
Durban Metropolitan Open Space System
Durban_Metropolitan_Open_Space_System
Type of application programming interface
you sent data). OpenAPI Specification Application enablement Open system (computing) Mashup (web application hybrid) Webhook Web API Open API Initiative
Open_API
Cross-platform graphics API
books (pre-OpenGL 2.0): The Green Book OpenGL Programming for the X Window System. ISBN 978-0-201-48359-8 A book about X11 interfacing and OpenGL Utility
OpenGL
Flexible mechanism for authenticating users
Authorization Service Linux PAM OpenPAM Identity management – the general topic Name Service Switch – manages user databases System Security Services Daemon
Pluggable Authentication Module
Pluggable_Authentication_Module
Standard that is openly accessible and usable by anyone
assessment Open format Open-source software Free standard Network effect Open data Open-design movement Open-source hardware Open specifications Open system (computing)
Open_standard
US body that sets national monetary policy
The Federal Open Market Committee (FOMC) is a committee within the Federal Reserve System (colloquially "the Fed") that is charged under United States
Federal_Open_Market_Committee
Closed drainage basin that has no outflow
closed basins, terminal basins, and internal drainage systems. Endorheic regions contrast with open lakes (exorheic regions), where surface waters eventually
Endorheic_basin
Study of non-linear complex systems
System dynamics (SD) is an approach to understanding the nonlinear behaviour of complex systems over time using stocks, flows, internal feedback loops
System_dynamics
System where only the inputs and outputs can be viewed, and not its implementation
algorithm, the human brain, or an institution or government. To analyze an open system with a typical "black box approach", only the behavior of the stimulus/response
Black_box
Mode of role-playing gaming
role-playing game publishers have joined the open gaming movement, largely as a result of the release of the original System Reference Document (SRD) by Wizards
Open_gaming
Machine to increase pressure of gas by reducing its volume
secondly the motor of an open compressor can be serviced without opening any part of the refrigerant system. An open pressurized system such as an automobile
Compressor
Computer operating system
Haiku, originally OpenBeOS, is a free and open-source operating system for personal computers. It is a community-driven continuation of BeOS and aims to
Haiku_(operating_system)
Planetary system consisting of the Sun and objects orbiting it
The Solar System is an isolated single-star planetary system (not part of a larger star system) within the Milky Way Galaxy. The system formed about
Solar_System
Free software project
(2004). The Success of Open Source. Cambridge: Harvard University Press. "The four essential freedoms". GNU Operating System. Free Software Foundation
GNU_Project
Chess opening
The London System is an opening system in chess characterized by the moves (with any first move by Black): 1. d4 2. Bf4 In addition to these moves, in
London_System
American artificial intelligence company
subsequently invested $1 billion in OpenAI LP, and OpenAI's services were migrated to Microsoft Azure. Since then, OpenAI systems have run on an Azure-based supercomputing
OpenAI
Rewriting system and type of formal grammar
An L-system or Lindenmayer system is a parallel rewriting system and a type of formal grammar. An L-system consists of an alphabet of symbols that can
L-system
Public road or other public way on land
etc. The term has led to several related derived terms, including highway system, highway code, highway patrol and highwayman. Major highways are often named
Highway
Physical quantity
define the joule, for example. Beyond the constraints of closed systems, open systems can gain or lose energy in association with matter transfer (this
Energy
Cavities within the human brain
In neuroanatomy, the ventricular system is a set of four interconnected cavities known as cerebral ventricles in the brain. Within each ventricle is a
Ventricular_system
Distributed file system protocol
many other protocols, builds on the Open Network Computing Remote Procedure Call (ONC RPC) system. NFS is an open IETF standard. After the first experimental
Network_File_System
Method of data encryption
is decrypted by them is held open. Unlike cryptographic file systems or full disk encryption, general-purpose file systems that include filesystem-level
Filesystem-level_encryption
learning management systems (LMS). aTutor Canvas LMS Chamilo Claroline eFront FenixEdu ILIAS LAMS LON-CAPA Moodle Open edX OLAT OpenOLAT Sakai SWAD WeBWorK
List of learning management systems
List_of_learning_management_systems
Open-source autonomous AI assistant software
enabling persistent and adaptive behavior across sessions. OpenClaw uses a skills system[clarification needed what is this exactly?] in which skills
OpenClaw
Guided missile for combat against armored targets
protection system can not keep up. Traditionally, before "fire-and-forget" ATGMs were used, the most effective countermeasure was to open fire at the
Anti-tank_guided_missile
Freely licensed software with open code
public domain software ecosystem of the 1960s to 1980s. Free and open-source operating systems such as Linux distributions and descendants of BSD are widely
Free_and_open-source_software
Portion of the universe chosen for analysis
Signal-flow graph Systems engineering Systems science Thermodynamic system Open quantum system Belkind, Ori (2 February 2012). Physical Systems: Conceptual
Physical_system
Digital collection of patient and population electronically stored health information
Retrieved 4 February 2025. Can Electronic Health Record Systems Transform Health Care? Open-Source EHR Systems for Ambulatory Care: A Market Assessment Archived
Electronic_health_record
Instruments measuring photosynthetic rates
photosynthetic system are the leaf chamber, infrared gas analyzer (IRGA), batteries and a console with keyboard, display and memory. Modern 'open system' photosynthesis
Photosynthesis_system
Published specification for storing digital data
resources Open system Free content Network effect Proprietary file format Vendor lock-in Open Document Format for Office Applications (OpenDocument) v1
Open_file_format
Brazilian instant payment ecosystem
availability, the speed of transactions using the system, low-cost functionality, convenience, versatility, open environment, and safety. Pix allows instant
Pix_(payment_system)
Copy-on-write file system
Microsystems Solaris operating system in 2001. Large parts of Solaris, including ZFS, were published under an open source license as OpenSolaris in 2005. During
ZFS
Tabletop role-playing game
The Gumshoe System (stylised as The GUMSHOE System) is a role-playing game system created in 2007 by Robin Laws, designed for running investigative scenarios
Gumshoe_System
Property of a thermodynamic system
system across the system boundaries, plus the rate at which θ {\textstyle \theta } is generated within the system. For an open thermodynamic system in
Entropy
Tennis championship
win the men's singles tennis title at the 2026 Australian Open. It was his first Australian Open title and seventh major title overall, becoming the ninth
2026 Australian Open – Men's singles
2026_Australian_Open_–_Men's_singles
Operating system by Google
Fuchsia is an open-source capability-based operating system developed by Google. In contrast to Google's Linux-based operating systems such as ChromeOS
Fuchsia_(operating_system)
that the system remains essentially at equilibrium during the process. The opposite of a thermally isolated system is a thermally open system, which allows
Thermally_isolated_system
Family of Unix-like operating systems
Linux (/ˈlɪnʊks/ LIN-uuks) is a family of free and open-source software Unix-like operating systems based on the Linux kernel, which was first released
Linux
List of e-mail servers suspected of enabling spam
SORBS ("Spam and Open Relay Blocking System") was a list of e-mail servers suspected of sending or relaying spam (a DNS Blackhole List). It had been augmented
Spam and Open Relay Blocking System
Spam_and_Open_Relay_Blocking_System
Closed-loop molecular structure
same or different ring systems) is termed a polycyclic compound. A molecule containing no rings is called an acyclic or open-chain compound. A homocycle
Ring_(chemistry)
Office furniture meant to allow for concentration
projection system, advanced individual lighting, heating and ventilation controls, and guest-detecting privacy systems. During the 2000s and 2010s, open plan
Cubicle
OPEN SYSTEM
OPEN SYSTEM
Boy/Male
English French
Open.
Boy/Male
American, British, English, French
Open; Variant of Darrel Open
Boy/Male
Celtic Welsh
Son of Owen.
Boy/Male
English French American
Open.
Boy/Male
French
Open.
Female
Thai/Siamese
Thai name PEN-CHAN means "full moon."
Surname or Lastname
English
English : variant of Penn.Dutch : metonymic occupational name for a clerk or penman, from Dutch pen ‘pen’.Cambodian : unexplained.
Boy/Male
Welsh
Son of Owen.
Female
English
English short form of Latin Penelope, PEN means "weaver of cunning."
Boy/Male
Hindu, Indian
Open
Male
Swedish
Norwegian and Swedish form of Old Norse Óðinn, ODEN means "poetry, song" and "eager, frenzied, raging."
Boy/Male
English French
Open.
Boy/Male
English French
Open.
Boy/Male
English French
Open.
Boy/Male
English French
Open.
Male
Welsh
Variant form of Welsh Owen, possibly OUEN means "born of yew."
Male
Welsh
 Modern Welsh form of Old Welsh Owain, OWEN means "born of yew." Compare with another form of Owen.
Male
English
 Anglicized form of Irish Gaelic Eóghan, OWEN means "born of yew." Compare with another form of Owen.
Boy/Male
English French
Open.
Boy/Male
English
Open.
OPEN SYSTEM
OPEN SYSTEM
Girl/Female
Hindu, Indian
Lord of Truth
Boy/Male
Scottish
Speckled.
Boy/Male
Hindu, Indian, Marathi
Much Liked
Girl/Female
Muslim
Pure Love
Boy/Male
Italian Teutonic
mighty protector'.
Boy/Male
English French
Steward or public official; man in charge.
Female
German
Variant spelling of Low German Swanhilda, SWANHILDE means "swan battle."
Girl/Female
Arabic, Indian, Kannada, Muslim
Generous
Male
Hungarian
Finnish and Hungarian form of Hebrew Aharown, �RON means "light-bringer."
Girl/Female
Hindu, Indian, Tamil
Worship
OPEN SYSTEM
OPEN SYSTEM
OPEN SYSTEM
OPEN SYSTEM
OPEN SYSTEM
a.
Having the mouth open; gaping; hence, greedy; clamorous.
a.
Produced by an open string; as, an open tone.
a.
Not concealed or secret; not hidden or disguised; exposed to view or to knowledge; revealed; apparent; as, open schemes or plans; open shame or guilt.
a.
Not settled or adjusted; not decided or determined; not closed or withdrawn from consideration; as, an open account; an open question; to keep an offer or opportunity open.
a.
Free of access; not shut up; not closed; affording unobstructed ingress or egress; not impeding or preventing passage; not locked up or covered over; -- applied to passageways; as, an open door, window, road, etc.; also, to inclosed structures or objects; as, open houses, boxes, baskets, bottles, etc.; also, to means of communication or approach by water or land; as, an open harbor or roadstead.
a.
Taking place in the open air; outdoor; as, an open-air game or meeting.
a.
Free to be used, enjoyed, visited, or the like; not private; public; unrestricted in use; as, an open library, museum, court, or other assembly; liable to the approach, trespass, or attack of any one; unprotected; exposed.
v. t.
To spread; to expand; as, to open the hand.
a.
Uttered with a relatively wide opening of the articulating organs; -- said of vowels; as, the an far is open as compared with the a in say.
a.
Free; disengaged; unappropriated; as, to keep a day open for any purpose; to be open for an engagement.
v. t.
To make or set open; to render free of access; to unclose; to unbar; to unlock; to remove any fastening or covering from; as, to open a door; to open a box; to open a room; to open a letter.
a.
Free or cleared of obstruction to progress or to view; accessible; as, an open tract; the open sea.
a.
Open.
a.
Not drawn together, closed, or contracted; extended; expanded; as, an open hand; open arms; an open flower; an open prospect.
n.
Open or unobstructed space; clear land, without trees or obstructions; open ocean; open water.
v. t.
To enter upon; to begin; as, to open a discussion; to open fire upon an enemy; to open trade, or correspondence; to open a case in court, or a meeting.
a.
With eyes widely open; watchful; vigilant.
a.
Not of a quality to prevent communication, as by closing water ways, blocking roads, etc.; hence, not frosty or inclement; mild; -- used of the weather or the climate; as, an open season; an open winter.
v. t.
To loosen or make less compact; as, to open matted cotton by separating the fibers.
v. t. & i.
To open.