Ignore v. t. : To be ignorant of or not acquainted with.

Ignore v. t. : To throw out or reject as false or ungrounded; -- said of a bill rejected by a grand jury for want of evidence. See Ignoramus.

Ignore v. t. : Hence: To refuse to take notice of; to shut the eyes to; not to recognize; to disregard willfully and causelessly; as, to ignore certain facts; to ignore the presence of an objectionable person.

Example:
How do you Ignore someone knocking on your door when your lights on?

Taxonomy
ig, Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, glossary, english, language, ESL, Search, nore, transitive verb, Inflected, nored, Etymology, ignorer, Latin.

Defination from the web:
ignore from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Etymology: obsolete ignore to be ignorant of, from French ignorer, from Latin ignorare, from ignarus ignorant, unknown, from in- + gnoscere, ...