• synonyms


[yoo-ni-di-rek-shuh-nl, -dahy-]
  1. operating or moving in one direction only; not changing direction: a unidirectional flow.
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Origin of unidirectional

First recorded in 1880–85; uni- + directional
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for unidirectional

Historical Examples

  • Two support rods and two cantilever springs were needed in place of the one in unidirectional scarificators.

    Bloodletting Instruments in the National Museum of History and Technology

    Audrey Davis

  • In some cases the alternating high-tension current is rectified and supplied as a unidirectional current to lamps in series.

British Dictionary definitions for unidirectional


  1. having, moving in, or operating in only one direction
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unidirectional


1883, from uni- + directional (see direction).

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Online Etymology Dictionary, © 2010 Douglas Harper