Definition of uncles:
(n) :
The brother or brother-in-law of one’s parent.
(n) :
The male cousin of one’s parent.
(n) :
(endearing) Used as a fictive kinship title for a close male friend of one's parent or parents.
(n) :
(figuratively) A source of advice, encouragement, or help.
(n) :
(especially in the Southern US, parts of UK and South Asia) An affectionate term for a man of an older generation than oneself, especially a friend of one's parents, by means of fictive kin.
(n) :
(Malaysia, Myanmar, Singapore, Brunei, informal) Any middle-aged or elderly man older than the speaker and/or listener.