a person who tells lies.

before 950; Middle English lier, Old English lēogere. See lie1, -ar1

liar, lyre.

falsifier, perjurer, prevaricator. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
liar (ˈlaɪə)
a person who has lied or lies repeatedly

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. leogere; agent noun from Anglian legan, W.Saxon leogan "be untruthful, lie" (see lie (v.1)).
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

Liar definition

MIT Scheme

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
If a liar tells us that lying is wrong, this makes him a hypocrite, but it does
  not invalidate his claim.
The liar will have you thinking that maybe the dog did eat the homework.
It is time to add jail sentences for being proven incompetent if not a liar.
These same limitations also apply to many newfangled approaches to catching a
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