colloquialism

from WordNet (r) 3.0 (2006)
colloquialism
    n 1: a colloquial expression; characteristic of spoken or
         written communication that seeks to imitate informal speech
    
from The Collaborative International Dictionary of English v.0.48
Colloquialism \Col*lo"qui*al*ism\, n.
   A colloquial expression, not employed in formal discourse or
   writing.
   [1913 Webster]
    

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