immersion

1. The total submerging of a person in water as an act of baptism. (countable, uncountable)
2. Deep engagement in something. (countable, uncountable)
3. A smooth map whose differential is everywhere injective, related to the mathematical concept of an embedding. (countable, uncountable)
4. 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. (countable, uncountable)
5. A form of foreign-language teaching where the language is used intensively to teach other subjects to a student. (countable, uncountable)
6. One's suspension of disbelief while reading, playing a video game, etc. The experience of losing oneself in a fictional world. (countable, uncountable)
7. A creative relationship with one's social and ecological environment as practiced by the Brooklyn Immersionists. (countable, uncountable)

Plural immersions