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]

Moby Thesaurus II by Grady Ward, 1.0:

96 Moby Thesaurus words for "egress":
   abandonment, adit, avenue, blowhole, bow out, channel, chute,
   cleaning out, clearance, clearing, conduit, course, debouch,
   decampment, defecation, depart, departure, depletion,
   discharging cargo, ditch, door, drainage, draining, duct,
   egression, elimination, emergence, emerging, emptying, emunctory,
   entrance, escape, estuary, evacuation, excretion, exhaust,
   exhausting, exhaustion, exit, exodus, flight, floodgate, flume,
   get out, getaway, go out, going, hegira, ingress, leaving,
   loophole, make an exit, march out, off-loading, opening, out,
   outcome, outfall, outgate, outgo, outlet, parting, pass out,
   passage, passageway, passing, pore, port, removal, retirement,
   retreat, run out, sally port, sluice, spiracle, spout, tap, trench,
   trough, troughing, troughway, tunnel, unloading, vent, ventage,
   venthole, venting, voidance, voiding, vomitory, walk out, walkout,
   way, way out, weir, withdrawal