— ingression /in gresh"euhn/ , n.
/in"gres/ , n.
1. the act of going in or entering.
2. the right to enter.
3. a means or place of entering; entryway.
4. Astron. immersion (def. 5).
[ 1400-50; late ME ingressus a going in, commencing, equiv. to ingred-, s. of ingredi to go or step into, commence (see IN- 2 , GRADIENT) + -tus suffix of v. action, with -dt- > -ss- ]