to refrain from noticing or recognizing: to ignore insulting remarks.
Law. (of a grand jury) to reject (a bill of indictment), as on the grounds of insufficient evidence.
Origin of ignore
1605–15; < Latinignōrāre to not know, disregard, verbal derivative of ignārus ignorant, unaware (with -ō- perhaps from ignōtus unknown), equivalent to in-in-3 + gnārus knowing, acquainted (with); akin to (g)nōscere to know1
Related formsig·nor·a·ble, adjectiveig·nor·er, nounun·ig·nor·a·ble, adjectiveun·ig·nor·a·bly, adverbun·ig·nored, adjectiveun·ig·nor·ing, adjectivewell-ig·nored, adjective
1610s, "not to know, to be ignorant of," from French ignorer "be unaware of," from Latin ignorare "not to know, disregard" (see ignorant). Sense of "pay no attention to" first recorded 1801 (Barnhart says "probably a dictionary word"), and not common until c.1850. Related: Ignored; ignoring.