Etymology
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egress (n.)

1530s, "act of going out," from Latin egressus "a going out," noun use of past participle of egredi "go out," from ex "out" (see ex-) + -gredi, combining form of gradi "step, go" (from PIE root *ghredh- "to walk, go"). Perhaps a back-formation from egression (early 15c.). Meaning "place of exit" is from 1670s. "One who goes out" is an egressor.

updated on February 01, 2018

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Definitions of egress from WordNet
1
egress (n.)
(astronomy) the reappearance of a celestial body after an eclipse;
Synonyms: emersion
egress (n.)
the becoming visible;
Synonyms: emergence / issue
egress (n.)
the act of coming (or going) out; becoming apparent;
Synonyms: egression / emergence
2
egress (v.)
come out of;
Synonyms: issue / emerge / come out / come forth / go forth
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.