to examine, study, or inquire into systematically; search or examine into the particulars of; examine in detail.
2.
to search out and examine the particulars of in an attempt to learn the facts about something hidden, unique, or complex, especially in an attempt to find a motive, cause, or culprit: The police are investigating the murder.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a fool or simpleton; ninny.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.