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

Law

• Concurrence, in jurisprudence, the need to prove both actus reus and mens rea
• Concurring opinion (also called a "concurrence"), a legal opinion which supports the conclusion, though not always the reasoning, of the majority.
• Concurrent estate, a concept in property law
• Concurrent resolution, a legislative measure passed by both chambers of the United States Congress
• Concurrent sentences, in criminal law, periods of imprisonment that are served simultaneously

Computing

• Concurrency (computer science), 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 pages