noun (n)

• the brother of your father or mother; the husband of your aunt(noun.person)

  Antonym:
  aunt, auntie, aunty
  

  source: wordnet30
• a source of help and advice and encouragement(noun.person)

  Example:
  He played uncle to lonely students.
  

  source: wordnet30
• The brother of one's father or mother; also applied to an aunt's husband; -- the correlative of aunt in sex, and of nephew and niece in relationship.(noun)

  source: webster1913
• An eldery man; -- used chiefly as a kindly or familiar appellation, esp. (Southern U. S.) for a worthy old negro; as, "Uncle Remus."(noun)

  source: webster1913