verb (1)
en·​train | \ in-ˈtrān How to pronounce entrain (audio) \
entrained; entraining; entrains

Definition of entrain

 (Entry 1 of 2)

transitive verb

1 : to draw along with or after oneself
2 : to draw in and transport (something, such as solid particles or gas) by the flow of a fluid
3 : to incorporate (air bubbles) into concrete
4 : to determine or modify the phase or period of circadian rhythms entrained by a light cycle


verb (2)
entrained; entraining; entrains

Definition of entrain (Entry 2 of 2)

transitive verb

: to put aboard a train

intransitive verb

: to go aboard a train

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Other Words from entrain

Verb (1)

entrainer noun
entrainment \ in-​ˈtrān-​mənt How to pronounce entrain (audio) \ noun

Examples of entrain in a Sentence

Recent Examples on the Web: Verb In big wildfires, nitrogen oxide released from plants by flames is entrained in smoke and wafted into the upper troposphere by the fire’s heat. Kyle Dickman, Scientific American, "The Hidden Toll of Wildfires," 1 Mar. 2020 Ticking away at the molecular level, the biological clock is entrained — or set — by exposure to sunlight and darkness. Washington Post, "Science Says: How daylight saving time affects health," 31 Oct. 2019 Soon after, other studies by separate research teams showed that numerous species of parrots could entrain to a beat, as could elephants. Quanta Magazine, "The Beasts That Keep the Beat," 22 Mar. 2016 But what Assaneo observed was rather more interesting and surprising, Poeppel said: The auditory and speech motor activities did stay entrained, but only up to about 5 hertz. Quanta Magazine, "How Brain Waves Surf Sound Waves to Process Speech," 22 May 2018 At this height the Senna’s double diffuser is fully entrained (higher downforce and less drag) due to a phenomenon pilots know as ground effects. Dan Neil, WSJ, "2019 McLaren Senna: A Pet Racecar for Billionaires," 31 May 2018 If spilled, heavy fuel oil would remain for long periods and could spread widely if entrained in moving ice. Anchorage Daily News, "Readers write: Letters to the editor, January 16, 2018," 16 Jan. 2018 The music entrains our feet and hands to move in that rhythm. Simon Worrall, National Geographic, "Dogs Have Feelings—Here's How We Know," 9 Sep. 2017 Fully entrained, the T8’s parallel-hybrid AWD power peaks at a nice, round 400 hp and even nicer 472 lb-ft of torque, same as the XC90 T8. Dan Neil, WSJ, "Volvo XC60 Hybrid SUV: Catch One If You Can," 8 Sep. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'entrain.' 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 entrain

Verb (1)

1568, in the meaning defined at sense 1

Verb (2)

1878, in the meaning defined at transitive sense

History and Etymology for entrain

Verb (1)

Middle French entrainer, from en- + trainer to draw, drag — more at train entry 2

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Time Traveler for entrain

Time Traveler

The first known use of entrain was in 1568

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Statistics for entrain

Cite this Entry

“Entrain.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/entrain. Accessed 5 Mar. 2021.

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More Definitions for entrain


transitive verb
en·​train | \ in-ˈtrān How to pronounce entrain (audio) \

Medical Definition of entrain

: to determine or modify the phase or period of circadian rhythms entrained by a light cycle

Other Words from entrain

entrainment \ -​ˈtrān-​mənt How to pronounce entrain (audio) \ noun

More from Merriam-Webster on entrain

Thesaurus: All synonyms and antonyms for entrain

Nglish: Translation of entrain for Spanish Speakers

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