Emersion \E*mer"sion\, n. [Cf. F. ['e]mersion. See Emerge.]

1. 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.

2. (Astron.) The reappearance of a heavenly body after an eclipse or occultation; as, the emersion of the moon from the shadow of the earth; the emersion of a star from behind the moon.

Source: Webster's Revised Unabridged Dictionary (1913)