[ih-mur-zhuhn, -shuhn]
an act or instance of immersing.
state of being immersed.
state of being deeply engaged or involved; absorption.
baptism in which the whole body of the person is submerged in the water.
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 ).
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.

1425–75; late Middle English < Late Latin immersiōn- (stem of immersiō) a dipping in. See immerse, -ion

nonimmersion, noun

emersion, immersion. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
immersion (ɪˈmɜːʃən)
1.  a form of baptism in which part or the whole of a person's body is submerged in the water
2.  astronomy Also: ingress the disappearance of a celestial body prior to an eclipse or occultation
3.  the act of immersing or state of being immersed

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

mid-15c., from L.L. immersionem (nom. immersio), noun of action from immergere, from L. in- "into" + 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.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

immersion im·mer·sion (ĭ-mûr'zhən, -shən)

  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.

im·merse' (ĭ-mûrs') v.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Certain songwriters demand of a performer nothing less than a go-for-broke
  immersion in the composer's private emotional world.
Yet, despite our increasing immersion in pleasurably designed scenes there is
  one startling gap.
So let's talk about what you might not get in that real-time self immersion
  that people might do.
Cutler used fresh and frozen chickens to see how immersion in water affected
  the posture of the dead birds.
Image for immersion
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