From Wiktionary, the free dictionary
Jump to navigation Jump to search





Borrowed from Late Latin synchronus, from Ancient Greek σύγχρονος (súnkhronos, contemporaneous), from σῠν- (sun-, with, together) + χρόνος (khrónos, time). By surface analysis, syn- +‎ chron- +‎ -ous = synchrony +‎ -ous; however, all related words (e.g., synchronic, synchrony, synchronicity, diachronous, diachronic, diachrony, diachronicity) were coined later, either as back-formations from, or otherwise by analogy with the surface analysis of, synchronous.


  • Audio (US):(file)
  • IPA(key): /ˈsɪŋkɹənəs/



synchronous (comparative more synchronous, superlative most synchronous)

  1. At the same time, at the same frequency.
    Synonyms: simultaneous, in phase, in synch, in step, synchronised
    Antonyms: asynchronous, antisynchronous
  2. (computing, of communication) Single-threaded; blocking; occurring in the same thread as other computations, thereby preventing those computations from resuming until the communication is complete.
    Synonyms: blocking, modal, single-threaded
    Antonym: asynchronous
    Coordinate term: plesiochronous
    • 2014, Richard Blewett, Andrew Clymer, Pro Asynchronous Programming with .NET, page 25:
      Post is a “fire and forget” where the UI thread work is performed asynchronously; Send is synchronous in that the call blocks until the UI thread work has been performed.



Derived terms