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immersion

[ih-mur-zhuh n, -shuh n]
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noun
  1. an act or instance of immersing.
  2. state of being immersed.
  3. state of being deeply engaged or involved; absorption.
  4. baptism in which the whole body of the person is submerged in the water.
  5. Also called ingress. Astronomy. the entrance of a heavenly body into an eclipse by another body, an occultation, or a transit.Compare emersion(def 1).
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adjective
  1. concentrating on one course of instruction, subject, or project to the exclusion of all others for several days or weeks; intensive: an immersion course in conversational French.
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Origin of immersion

1425–75; late Middle English < Late Latin immersiōn- (stem of immersiō) a dipping in. See immerse, -ion
Related formsnon·im·mer·sion, noun
Can be confusedemersion immersion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for immersion

immersion

noun
  1. a form of baptism in which part or the whole of a person's body is submerged in the water
  2. Also: ingress astronomy the disappearance of a celestial body prior to an eclipse or occultation
  3. the act of immersing or state of being immersed
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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 immersion

n.

mid-15c., from Late Latin immersionem (nominative immersio), noun of action from past participle stem of immergere, from assimilated form of in- "into, in, on, upon" (see in- (2)) + Latin mergere "plunge, dip" (see merge). Meaning "absorption in some interest or situation" is from 1640s. As a method of teaching a foreign language, it is from 1965, trademarked by the Berlitz company.

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Online Etymology Dictionary, © 2010 Douglas Harper

immersion in Medicine

immersion

(ĭ-mûrzhən, -shən)
n.
  1. The placing of a body under water or other liquid.
  2. The use of a fluid on a microscope slide in order to exclude air from between the glass slide and the bottom lens.
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Related formsim•merse (ĭ-mûrs) v.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.