immersion

noun9

1. •
   The act of immersing or the condition of being immersed.
2. •
   The total submerging of a person in water as an act of baptism.

   • 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. — 2016
3. •
   Deep engagement in something.

   • 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. — 2016
4. •
   One's suspension of disbelief while reading, playing a video game, etc. The experience of losing oneself in a fictional world.
5. •
   A form of foreign-language teaching where the language is used intensively to teach other subjects to a student.
6. •
   (UK, informal) An immersion heater.

   • She left the immersion on all the time, while I had been reared under pain of death to turn it off as soon as the bathwater was heated. — 2020
7. •
   A smooth map whose differential is everywhere injective, related to the mathematical concept of an embedding.

   • 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. — 2006
8. •
   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.
9. •
   A creative relationship with one's social and ecological environment as practiced by the Brooklyn Immersionists.