uni·​di·​rec·​tion·​al | \ ˌyü-ni-də-ˈrek-shnəl , -dī-, -shə-nᵊl\

Definition of unidirectional

1 : involving, functioning, moving, or responsive in a single direction a unidirectional microphone
2 : not subject to change or reversal of direction

Keep scrolling for more

Other Words from unidirectional

unidirectionally adverb

Examples of unidirectional in a Sentence

Recent Examples on the Web

Female lust, comprising all these repulsions, isn’t some blunt, unidirectional force. Lily Janiak, San Francisco Chronicle, "Young womanhood sopping wet with bodily fluids in Shotgun’s ‘Dry Land’," 31 May 2018 In both cases, movement is unidirectional, as in, everyone is trying to move in the same direction. Adam Rogers, WIRED, "The Hajj Stampede Is a Fluid Dynamics Problem," 24 Sep. 2015

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unidirectional.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of unidirectional

1883, in the meaning defined at sense 1

Keep scrolling for more

Learn More about unidirectional

Share unidirectional

Statistics for unidirectional

Look-up Popularity

Time Traveler for unidirectional

The first known use of unidirectional was in 1883

See more words from the same year

Keep scrolling for more

More Definitions for unidirectional


uni·​di·​rec·​tion·​al | \ ˌyü-ni-də-ˈrek-shnəl, -dī-, -shən-ᵊl \

Medical Definition of unidirectional

: involving, functioning, moving, or responsive in a single direction

Other Words from unidirectional

unidirectionally \ -​ē \ adverb

More from Merriam-Webster on unidirectional

Rhyming Dictionary: Words that rhyme with unidirectional

Comments on unidirectional

What made you want to look up unidirectional? Please tell us where you read or heard it (including the quote, if possible).


to deny responsibility for

Get Word of the Day daily email!

Test Your Vocabulary

What did you just call me?! A Quiz

  • rows-of-various-emoji
  • If a member of the audience describes your speech as bombastic, does that person mean it is:
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!