the act of going in or entering.
the right to enter.
a means or place of entering; entryway.
Astronomy, immersion ( def 5 ).

1400–50; late Middle English < Latin ingressus a going in, commencing, equivalent to ingred-, stem of ingredī to go or step into, commence (see in-2, gradient) + -tus suffix of v. action, with -dt- > -ss-

ingression [in-gresh-uhn] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ingress (ˈɪŋɡrɛs)
1.  the act of going or coming in; an entering
2.  a way in; entrance
3.  the right or permission to enter
4.  astronomy another name for immersion
[C15: from Latin ingressus, from ingredī to go in, from gradī to step, go]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

early 15c., from L. ingressus "entrance," from pp. stem of ingredi "to step into, enter" (see ingredient).
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


in astronomy, the apparent entrance of a smaller body upon the disk of a larger one as the smaller passes between the larger and the observer-e.g., the entrance of a satellite or its shadow on the disk of a planet. The term is also applied to the Moon's entrance into the Earth's shadow at the start of a lunar eclipse and to the Sun's entrance into a zodiacal constellation.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The difficulty of obtaining ingress to the hall, owing to the crowd that.
It's an invasion, with helicopters and supply lines and routes of ingress and escape.
It also has a convenient tilt-away provision for easy ingress and egress.
Mike noted that the developer has requested a variance allowing for one point of ingress-egress.
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