Definition: liar

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Source: WordNet (r) 1.7 

liar
     n : a person who has lied or who lies repeatedly [syn: prevaricator]
         [ant: square shooter]

Source: Webster's Revised Unabridged Dictionary (1913) 

Liar \Li"ar\ (l[imac]"[~e]r), n. [OE. liere. See Lie to
   falsify.]
   A person who knowingly utters falsehood; one who lies.

Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

Liar

   MIT Scheme

Source: THE DEVIL'S DICTIONARY ((C)1911 Released April 15 1993) 

LIAR, n.  A lawyer with a roving commission.