/ ˈʌŋkl; NAmE / noun
1.
the brother of your mother or father; the husband of your aunt :
Uncle Ian
I'm going to visit my uncle.
I've just become an uncle (= because your brother / sister has had a baby) .
2.
used by children, with a first name, to address a man who is a close friend of their parents
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IDIOMS
see Bob
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WORD ORIGIN
Middle English : from Old French oncle , from late Latin aunculus , alteration of Latin avunculus maternal uncle, diminutive of avus grandfather.