uncle

un‧cle S2 W3 /ˈʌŋkəl/ BrE AmE noun [countable]
[Date: 1200-1300; Language: Old French; Origin: Latin avunculus 'mother's brother']
1. the brother of your mother or father, or the husband of your aunt ⇨ aunt:
I went to stay with my uncle and aunt for a few days.
Uncle Philip
I was very excited about becoming an uncle (=your sister or your brother’s wife has a child).
2. used by children, in front of a first name, to address or refer to a man who is a close friend of their parents
3. say uncle American English spoken used by children to tell someone to admit they have been defeated

Oxford Advanced Learner's Dictionary

uncle

uncle [uncle uncles] [ˈʌŋkl] [ˈʌŋkl] 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
see Bob's your uncle at Bob
Word Origin:
Middle English: from Old French oncle, from late Latin aunculus, alteration of Latin avunculus ‘maternal uncle’, diminutive of avus ‘grandfather’.
Example Bank:
• He looks so much like his late uncle.
• The boss smiled at us all like a benevolent uncle.

• the fortune left to her by her dead uncle

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition

uncle / ˈʌŋ.kl̩ / noun [ C ]

A2 the brother of someone's mother or father, or the husband of someone's aunt or uncle:

I've got several uncles and aunts.

We invited my Uncle Steve round.

[ as form of address ] Did you bring me a present, Uncle Jack?

Indian English any male adult that you know who is older than you:

John Uncle

Collins Advanced Learner’s English Dictionary

uncle

[ʌ̱ŋk(ə)l]
♦♦
uncles
N-FAMILY; N-TITLE
Someone's uncle is the brother of their mother or father, or the husband of their aunt.
  My uncle was the mayor of Memphis...
  A telegram from Uncle Fred arrived...
  Uncle, pa wants to see you.

Merriam-Webster's Advanced Learner's Dictionary

uncle

un·cle /ˈʌŋkəl/ noun, pl un·cles
1 [count] : the brother of your father or mother or the husband of your aunt
• I have three uncles and two aunts.
• My Uncle David is visiting next week.
2 US informal
- used as a word that you say when you are being hurt in a fight to show that you admit being defeated and do not want to continue fighting
• He was forced to cry/say uncle. [=forced to surrender]
and Bob's your uncle
- see bob