noun /ɪˈmɜːrʒən/
  1. [uncountable] technical the language teaching method in which people are put in situations where they have to use the new language
  2. (in sth) the state of being completely involved in sth
    • his long immersion in politics
    • a two-week immersion course in French (= in which the student will hear and use only French)
  3. (in sth) the act of putting sb/sth into a liquid so that they or it are completely covered; the state of being completely covered by a liquid
    • Immersion in cold water resulted in rapid loss of heat.
    • baptism by total immersion (= putting the whole body underwater)

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