Immersion

[Sarah]

The dissapearance of a celestail body, by passing either behindanother, as in the occultation of a star, or into its shadow, as inthe eclipse of a satellite; -- opposed to emersion. Immersion lens, amicroscopic objective of short focal distance designed to work with adrop of liquid, as oil, between the front lens and the slide, so thatthis lens is practically immersed.

[Sarah]

When you're into something and someone just comes by and ruins it for you.

[Jason Yan]

The action of immersing someone or something in a liquid.

[Cami]

the fact of becoming completely involved in something: