(1):
(n.) Power or liberty of entrance or access; means of entering; as, all ingress was prohibited.
(2):
(n.) The entrance of the moon into the shadow of the earth in eclipses, the sun's entrance into a sign, etc.
(3):
(v. i.) To go in; to enter.
(4):
(n.) The act of entering; entrance; as, the ingress of air into the lungs.