The total submerging of a person in water as an act of baptism. / Deep engagement in something. / (Britain, Ireland, informal) An immersion heater.

plural of immersion

(transitive) To place within a fluid (generally a liquid, but also a gas). / (transitive) To involve or engage deeply. / (transitive, mathematics) To map into an immersion.

(obsolete) Immersed; buried; sunk.

Under the surface of a liquid; sunk. / Deeply involved.

simple past tense and past participle of immerse

Not susceptible to harm if immersed in water.

present participle of immerse

Third-person singular simple present indicative form of immerse

Tending to immerse. / Giving the impression of immersion.