\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.