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The act of emerging, or of rising out of anything; as, emersion from the sea; emersion from obscurity or difficulties. Their immersion into water and their emersion out of the same. Knatchbull.

The act of plunging into a fluid; a drowning.

ccultation of a star, or into its shadow, as in the eclipse of a satellite; -- opposed to emersion. Immersion lens, a microscopic objective of short focal distance designed to work with a drop of liquid, as oil, between the front lens and the slide, so that this lens is practically immersed.