immersion

UK: /ɪˈmɜː^rʃ^ən/ US: /ɪˈmɝʒən, -ʃən/ ,(i mûr′zhən, -shən)

WordReference Random House Learner's Dictionary of American English © 2026

im•mer•sion /ɪˈmɜrʒən, -ʃən/   n. 

1. the act of immersing:
   [countable] a quick immersion into local politics.
2. [uncountable] the state of being immersed.

See -merg-.

WordReference Random House Unabridged Dictionary of American English © 2026

im•mer•sion  (i mûr′zhən, -shən), n. 

1. an act or instance of immersing.
2. state of being immersed.
3. state of being deeply engaged or involved;
   absorption.
4. Religion baptism in which the whole body of the person is submerged in the water.
5. Astronomy Also called ingress. the entrance of a heavenly body into an eclipse by another body, an occultation, or a transit. Cf. emersion (def. 1).

adj. 

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.

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

Collins Concise English Dictionary © HarperCollins Publishers::

immersion / ɪˈmɜːʃən/ 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 the disappearance of a celestial body prior to an eclipse or occultation
3. the act of immersing or state of being immersed