invasion, n. irruption, [foray], [raid], aggression; [violation], [infringement], [encroachment], [intrenchment].
inveigle, v. [wheedle], [seduce].
inveiglement, n. [wheedling], [seduction].
investigate, v. [probe], [sift], [examine].
investigation, n. [examination], [inquiry], research.
invidious, a. [objectionable], [offensive].
invincible, a. indomitable, [unconquerable].
invisible, a. imperceptible, microscopic, evanescent.
invitation, n. [bidding], [call], summons.
invite, v. [bid], [ask], summon; [allure], induce, [entice].