Source : Webster's Revised Unabridged Dictionary (1913)

Ingress \In"gress\, n. [L. ingressus, fr. ingredi. See
   {Ingredient}.]
   1. The act of entering; entrance; as, the ingress of air into
      the lungs.

   2. Power or liberty of entrance or access; means of entering;
      as, all ingress was prohibited.

   3. (Astron.) The entrance of the moon into the shadow of the
      earth in eclipses, the sun's entrance into a sign, etc.

Ingress \In"gress\, v. i.
   To go in; to enter. [R.]

Source : WordNet®

ingress
     n 1: (astronomy) the disappearance of a celestial body prior to
          an eclipse [syn: {immersion}] [ant: {egress}, {egress}]
     2: the act of entering; "she made a grand entrance" [syn: {entrance},
         {entering}, {entry}, {incoming}]