idiolect

from WordNet (r) 3.0 (2006)
idiolect
    n 1: the language or speech of one individual at a particular
         period in life
    
from The Collaborative International Dictionary of English v.0.48
idiolect \idiolect\ n. (Linguistics)
   the language or speech of one individual at a particular
   period in life.
   [WordNet 1.5]
    

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