What is the meaning of Uncle?

The brother or brother-in-law of one’s parent.

The male cousin of one’s parent.

Used as a fictive kinship title for a close male friend of one's parent or parents.

Used as a title for the male companion to one's (usually unmarried) parent.

A source of advice, encouragement, or help.

A pawnbroker.

An affectionate term for a man of an older generation than oneself, especially a friend of one's parents, by means of fictive kin.

An older African-American male.

Any middle-aged or elderly man older than the speaker and/or listener.

A cry used to indicate surrender.

To address somebody by the term uncle.

To act like, or as, an uncle.

uncle (brother of one's parents)

Alternative form of oncle

uncle

Source: wiktionary.org