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 resolut ...

, 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 concur ...

, the property of program, algorithm, or problem decomposition into order-independent or partially-ordered units * Concurrent computing, the overlapping execution of multiple interacting computational tasks * Concurrence (quantum computing), a measure used in quantum information theory * Concurrent Computer Corporation, an American computer systems manufacturer * Concurrent DOS, Digital Research's multiuser multitasking operating system, with "Concurrent" once being their registered trademark * Concurrence, a presentation program designed by Lighthouse Design for NeXTSTEP which inspired Keynote by Apple

Engineering

* Concurrent engineering, an engineering methodology emphasizing the parallelisation of tasks * Concurrent Design Facility, an assessment center of the European Space Agency using concurrent engineering methods

Other

* Concurrent lines, in geometry, multiple lines or curves intersecting at a single point * Concurrency (road), 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