Etymology
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ingress (n.)

mid-15c., from Latin ingressus "an advance; walking; an entry," from ingress-, past participle stem of ingredi "to step into, enter," from in- "in" (from PIE root *en "in") + gradi "to step, go" (from PIE root *ghredh- "to walk, go"). The verb meaning "to enter, go in" sometimes said to be American English, but it is attested from early 14c.

updated on February 01, 2018

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Definitions of ingress from WordNet

ingress (n.)
(astronomy) the disappearance of a celestial body prior to an eclipse;
Synonyms: immersion
ingress (n.)
the act of entering;
Synonyms: entrance / entering / entry / incoming
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.