in·​ter·​ac·​tion | \ ˌin-tər-ˈak-shən \

Definition of interaction

: mutual or reciprocal action or influence

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Other Words from interaction

interactional \ ˌin-​tər-​ˈak-​shnəl , -​shə-​nᵊl \ adjective

Synonyms & Antonyms for interaction


commerce, dealings, intercourse, relation



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Examples of interaction in a Sentence

she guessed from the friendly interaction that they were close to the other parents in the organization

Recent Examples on the Web

Jobs requiring high levels of social interaction grew by nearly 12 percentage points as a share of the U.S. labor force between 1980 and 2012, according to a study published last year by David Deming, professor at the Harvard Kennedy School. Kate King, WSJ, "Wanted: Employees Who Can Shake Hands, Make Small Talk," 9 Dec. 2018 That sort of interaction can't scale very well, but phishing seems to only be growing in its popularity. Sean Gallagher, Ars Technica, "How to win (or at least not lose) the war on phishing? Enlist machine learning," 7 Aug. 2018 Each of the triplets was placed with a family that had already adopted a girl, so the researchers could study the children's interaction and the parents' treatment of them. J.r. Jones, Chicago Reader, "Triplets ripped from family in a Nazi-like experiment, probed in Three Identical Strangers," 5 July 2018 There are the people who do the logistics work, taking orders from algorithms to keep global markets humming, while exercising no real initiative and having little concrete human interaction. Jedediah Purdy, The New Republic, "The Remaking of Class," 27 June 2018 Michael does very well with one-on-one interactions and with positive attention. Boys & Girls Aid / Community Content Partner,, "A Home of His Own: Marshall, 7, has never met a train he didn't like!," 8 June 2018 Any discrepancy might point to new interactions and help particle theorists figure out what dark matter is. Adrian Cho, Science | AAAS, "Galaxy simulations are at last matching reality—and producing surprising insights into cosmic evolution," 30 May 2018 Michelle Obama had the sweetest interaction with an eight-year-old fan during a book signing last week. Isabel Greenberg, Harper's BAZAAR, "This Video of an 8-Year-Old Girl Meeting Michelle Obama Is the Best Thing on Twitter," 20 Dec. 2018 But Mattis has tried to downplay what the military will do at the border, saying most are not carrying weapons and will have minimal interaction with migrants. Tara Golshan, Vox, "What Trump’s “lethal force” authorization means at the border," 27 Nov. 2018

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

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First Known Use of interaction

1832, in the meaning defined above

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Last Updated

16 Jan 2019

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Time Traveler for interaction

The first known use of interaction was in 1832

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More Definitions for interaction


in·​ter·​ac·​tion | \ ˌin-tər-ˈak-shən \

Kids Definition of interaction

1 : the act of talking or doing things with other people Board games encourage interaction.
2 : the action or influence of things on one another interaction of the heart and lungs


in·​ter·​ac·​tion | \ ˌint-ə-ˈrak-shən \

Medical Definition of interaction

: mutual or reciprocal action or influence interaction of the heart and lungs

Other Words from interaction

interactional \ -​shnəl, -​shən-​ᵊl \ adjective

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Comments on interaction

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


tremendous in size, volume, or degree

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