concurrent

comparative more concurrent · superlative most concurrent

1. Happening at the same time; simultaneous.

   concurrent echo

   1627 (indicated as 1626), Francis [Bacon], “III. Century.”, in Sylua Syluarum: Or A Naturall Historie. In Ten Centuries. […], London: […] William Rawley […]; [p]rinted by J[ohn] H[aviland] for William Lee […], →OCLC

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   Such are the changes which science recognizes in the wire itself, as concurrent with the visual changes taking place in the eye.

   1865, John Tyndall, “On Radiation”, in Fragments of Science for Unscientific People, pages 171–2

   In 1915, concurrent with the L.S.W.R. electrification, power was supplied from the Waterloo sub-station, and the old equipment held in reserve. Some generator sets were removed, and motor generators installed for standby lighting and other services.

   1958 August 28, T. S. Lascelles, “Diamond Jubilee of the Waterloo & City Railway”, in Railway Magazine, page 523

2. Belonging to the same period; contemporary.
3. Acting in conjunction; agreeing in the same act or opinion; contributing to the same event or effect.

   the concurrent testimony of antiquity

   1738–1741, William Warburton, The Divine Legation of Moses […], volume (please specify |volume=I, II.1, or II.2), London: […] Fletcher Gyles, […], →OCLC

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   I join with these laws the personal presence of the king's son, as a concurrent cause of this reformation.

   1612, John Davies, Discoverie of the True Causes why Ireland was never entirely subdued

4. Joint and equal in authority; taking cognizance of similar questions; operating on the same objects.

   the concurrent jurisdiction of courts

5. geometryMeeting in one point.
6. Running alongside one another on parallel courses; moving together in space.
7. computingDesigned to run independently, rather than sequentially, using various mechanisms, such as threads, event loops or time-slicing.

   Different concurrent designs enable different ways to parallelize.

   2012, Rob Pike, “Concurrency is not Parallelism”, in Waza Conference, San Francisco, page 21

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   Informally, a concurrent program is one that does more than one thing at a time. […] However, this simultaneity is sometimes an illusion.

   2000, Douglas Lea, Concurrent Programming in Java, Addison-Wesley, →ISBN, page 19

   More precisely, a concurrent algorithm (or concurrent program) is the description of a set of sequential state machines that cooperate through a communication medium, e. g., a shared memory.

   2012, Michel Raynal, Concurrent Programming, Springer Science & Business, →ISBN, page 4

   Many languages are dogmatic about the solutions they offer for handling concurrent problems. For example, Erlang has elegant functionality for message-passing concurrency but has only obscure ways to share state between threads.

   2018, Steve Klabnik, Carol Nichols, The Rust Programming Language, No Starch Press, →ISBN, page 342

   Antonyms: sequential

plural concurrents

1. One who, or that which, concurs; a joint or contributory cause.

   To all affairs of importance there are three necessary concurrents […] time, industry, and faculties.

   1667, attributed to Richard Allestree, The Causes of the Decay of Christian Piety. […], London: […] R. Norton for T. Garthwait, […], →OCLC

2. One pursuing the same course, or seeking the same objects; hence, a rival; an opponent.

   Menander […] had no concurrent in his time that came neere vnto him

   1601, C[aius] Plinius Secundus [i.e., Pliny the Elder], “(please specify |book=I to XXXVII)”, in Philemon Holland, transl., The Historie of the World. Commonly Called, The Naturall Historie of C. Plinius Secundus. […], (please specify |tome=1 or 2), London: […] Adam Islip, →OCLC

3. One of the supernumerary days of the year over fifty-two complete weeks; so called because they concur with the solar cycle, the course of which they follow.
4. One who accompanies a sheriff's officer as witness.