• (GA) IPA: /ɪˈmɝʒən/


  1. The act of immersing or the condition of being immersed.
    1. The total submerging of a person in water as an act of baptism.
      • 2016, Risto Uro, Ritual and Christian Beginnings, Oxford University Press (ISBN 9780199661176), page gbooks y4PnCwAAQBAJ:
        Jesus did not become known as a baptizer (cf. however John 3:26 and 4:1), but we can recognize the same ritual structure in his healing practice as in John's immersion.
    2. Deep engagement in something.
      • 2016, David Waugh, ‎Sally Neaum, ‎Rosemary Waugh, Children's Literature in Primary Schools (page 80)
        Recognising and knowing how to understand visual imagery in relation to a narrative in picture books is primarily a matter of immersion in books within a specific culture.
  2. (British, Ireland, informal) An immersion heater.
  3. (mathematics) A smooth map whose differential is everywhere injective, related to the mathematical concept of an embedding.
    • 2006, William F. Basener, Topology and Its Applications, John Wiley & Sons (ISBN 9780471687559), page gbooks hn8y3dCP2c8C:
      Note that every embedding is an immersion, but the converse is not true. For an immersion to be an embedding, it must be one-to-one and the inverse must be continuous.
  4. (astronomy) The disappearance of a celestial body, by passing either behind another, as in the occultation of a star, or into its shadow, as in the eclipse of a satellite.
    Antonyms: emersion
    • 2009, Steven Wepster, Between Theory and Observations, Springer Science (ISBN 9781441913142), page gbooks Sx41OOG1zdsC:
      An occultation of a star by the moon provides two sharply defined observable phenomena: the disappearance of a star behind the disc of the moon (called its immersion), and its subsequent reappearance (or emersion).
  5. (education) A form of foreign-language teaching where the language is used intensively to teach other subjects to a student.
    • 2001, Mary Goebel Noguchi, Sandra Fotos, Studies in Japanese Bilingualism, Multilingual Matters (ISBN 9781853594908), page gbooks lDBCqwLfp8UC:
      Although numerous studies have reported the effectiveness of immersion programmes in developing relatively high levels of second language proficiency without any tradeoff of first language development or subject matter mastery, little is known of immersion education in Japan.
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