Webster's Revised Unabridged Dictionary · 1913

Ignore

Ignore , transitive verb

[Latin ignorare; pref. in- not + the root of gnarus knowing, noscere to become acquainted with. See Know, and compare Narrate.]

1.
To be ignorant of or not acquainted with. [Archaic]
Philosophy would solidly be established, if men would more carefully distinguish those things that they know from those that they ignore. — Boyle
2.
(Law) To throw out or reject as false or ungrounded; -- said of a bill rejected by a grand jury for lack of evidence. See Ignoramus.
3.
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.
Ignoring Italy under our feet, And seeing things before, behind. — Mrs. Browning