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).


  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.


  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

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.


  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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