The Collaborative International Dictionary of English v.0.48:

Egress \E"gress\, n. [L. egressus, fr. egredi to go out; e out +
   gradi to go. See Grade.]
   1. The act of going out or leaving, or the power to leave;
      departure.
      [1913 Webster]

            Embarred from all egress and regress. --Holland.
      [1913 Webster]

            Gates of burning adamant,
            Barred over us, prohibit all egress.  --Milton.
      [1913 Webster]

   2. (Astron.) The passing off from the sun's disk of an
      inferior planet, in a transit.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Egress \E*gress"\, v. i.
   To go out; to depart; to leave.
   [1913 Webster]

WordNet (r) 3.0 (2006):

egress
    n 1: (astronomy) the reappearance of a celestial body after an
         eclipse [syn: egress, emersion] [ant: immersion,
         ingress]
    2: the becoming visible; "not a day's difference between the
       emergence of the andrenas and the opening of the willow
       catkins" [syn: emergence, egress, issue]
    3: the act of coming (or going) out; becoming apparent [syn:
       egress, egression, emergence]
    v 1: come out of; "Water issued from the hole in the wall"; "The
         words seemed to come out by themselves" [syn: issue,
         emerge, come out, come forth, go forth, egress]