Wordnet 3.0
NOUN (2)
1.
the brother of your father or mother;
the husband of your aunt;
2.
a source of help and advice and encouragement;
- Example: "he played uncle to lonely students"
The Collaborative International Dictionary of English v.0.48:
Uncle \Un"cle\, n. [OE. uncle, OF. oncle, uncle, F. oncle, fr.
L. avunculus a maternal uncle, dim. of avus a grandfather;
akin to Lith. avynas uncle, Goth. aw? grandmother, Icel.
[=a]i great grandfather.]
1. 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.
[1913 Webster]
2. A pawnbroker. [Slang] --Thackeray.
[1913 Webster]
3. An eldery man; -- used chiefly as a kindly or familiar
appellation, esp. (Southern U. S.) for a worthy old negro;
as, "Uncle Remus." [Colloq.]
Plain old uncle as he [Socrates] was, with his great
ears, -- an immense talker. --Emerson.
[Webster 1913 Suppl.]
My uncle, a pawnbroker. [Slang]
Uncle Sam, a humorous appellation given to the United
States Government. See Uncle Sam, in Dictionary of Noted
Names in Fiction.
[1913 Webster]
WordNet (r) 3.0 (2006):
uncle
n 1: the brother of your father or mother; the husband of your
aunt [ant: aunt, auntie, aunty]
2: a source of help and advice and encouragement; "he played
uncle to lonely students"
Moby Thesaurus II by Grady Ward, 1.0:
43 Moby Thesaurus words for "uncle":
aunt, auntie, blood brother, brethren, brother, bub, bubba, bud,
buddy, country cousin, cousin, cousin once removed,
cousin twice removed, daughter, father, first cousin,
foster brother, frater, grandnephew, grandniece, granduncle,
great-aunt, great-uncle, half brother, kid brother, mother, nephew,
niece, nuncle, nunks, nunky, second cousin, sis, sissy, sister,
sister-german, sistern, son, stepbrother, stepsister, unc, uncs,
uterine brother
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
UNCLE
Unix Net for Computer security in Law Enforcement (org., USA,
Unix), "U.N.C.L.E."