Concurrent means happening at the same time. Concurrency, concurrent, or concurrence may refer to:

Law

Concurrence In Western jurisprudence, concurrence (also contemporaneity or simultaneity) is the apparent need to prove the simultaneous occurrence of both ("guilty action") and ("guilty mind"), to constitute a crime; except in crimes of strict liability ...

, in jurisprudence, the need to prove both ''actus reus'' and ''mens rea'' *

Concurring opinion In law, a concurring opinion is in certain legal systems a written opinion by one or more judges of a court which agrees with the decision made by the majority of the court, but states different (or additional) reasons as the basis for their deci ...

(also called a "concurrence"), a legal opinion which supports the conclusion, though not always the reasoning, of the majority. *

Concurrent estate In property law, a concurrent estate or co-tenancy is any of various ways in which property is owned by more than one person at a time. If more than one person owns the same property, they are commonly referred to as co-owners. Legal terminolo ...

, a concept in property law *

Concurrent resolution A concurrent resolution is a resolution (a legislative measure) adopted by both houses of a bicameral legislature that lacks the force of law (is non-binding) and does not require the approval of the chief executive (president). Concurrent resoluti ...

, a legislative measure passed by both chambers of the United States Congress *

Concurrent sentence In law, a sentence is the punishment for a crime ordered by a trial court after conviction in a criminal procedure, normally at the conclusion of a trial. A sentence may consist of imprisonment, a fine, or other sanctions. Sentences for mul ...

s, in criminal law, periods of imprisonment that are served simultaneously

Computing

Concurrency (computer science) In computer science, concurrency is the ability of different parts or units of a program, algorithm, or problem to be executed out-of-order or in partial order, without affecting the outcome. This allows for parallel execution of the concurr ...

, the property of program, algorithm, or problem decomposition into order-independent or partially-ordered units *

Concurrent computing Concurrent computing is a form of computing in which several computations are executed '' concurrently''—during overlapping time periods—instead of ''sequentially—''with one completing before the next starts. This is a property of a syst ...

, the overlapping execution of multiple interacting computational tasks *

Concurrence (quantum computing) In quantum information science, the concurrence is a state invariant involving qubits. Definition The concurrence is an entanglement monotone (a way of measuring entanglement) defined for a mixed state of two qubits as: : \mathcal(\rho)\equiv\max ...

, a measure used in quantum information theory *

Concurrent Computer Corporation Concurrent Computer Corporation was an American computer company, in existence from 1985 to 2017, that made real-time computing and parallel processing systems. Its products powered a variety of applications including process control, simulators ...

, an American computer systems manufacturer *

Concurrent DOS Multiuser DOS is a Real-time operating system, real-time multi-user multi-tasking operating system for IBM Personal Computer, IBM PC-compatible microcomputers. An evolution of the older Concurrent CP/M-86, Concurrent DOS and Concurrent DOS 386 ...

, Digital Research's multiuser multitasking operating system, with "Concurrent" once being their registered trademark * Concurrence, a presentation program designed by

Lighthouse Design Lighthouse Design Ltd. was an American software company that operated from 1989 to 1996. Lighthouse developed software for NeXT computers running the NEXTSTEP, NeXTSTEP operating system. The company was founded in 1989 by Alan Chung, Roger Rosner ...

for NeXTSTEP which inspired Keynote by Apple

Engineering

Concurrent engineering Concurrent engineering (CE) or concurrent design and manufacturing is a work methodology emphasizing the parallelization of tasks (i.e. performing tasks concurrently), which is sometimes called simultaneous engineering or integrated product develo ...

, an engineering methodology emphasizing the parallelisation of tasks *

Concurrent Design Facility The Concurrent Design Facility (CDF) is the European Space Agency main assessment center for future space missions and industrial review. Located at ESTEC, ESA's technical center in Noordwijk in The Netherlands, it has been operational since early ...

, an assessment center of the European Space Agency using concurrent engineering methods

Other

Concurrent lines In geometry, lines in a plane or higher-dimensional space are said to be concurrent if they intersect at a single point. They are in contrast to parallel lines. Examples Triangles In a triangle, four basic types of sets of concurrent lines are ...

, in geometry, multiple lines or curves intersecting at a single point *

Concurrency (road) A concurrency in a road network is an instance of one physical roadway bearing two or more different route numbers. When two roadways share the same right-of-way, it is sometimes called a common section or commons. Other terminology for a concurre ...

, an instance of one physical road bearing two or more different route numbers * Concurrent (Easter), the weekday of 24 March Julian used to calculate Julian Easter * Concurrent enrolment, a process in the US allowing students to enroll at a university or college while still in high school {{Disambiguation