immersion

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).

adjective

6. 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.

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

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.

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.