n, pl  -gies  1  :  the science of speech sounds including esp. the history and theory of sound changes in a language or in two or more related languages  2  :  the phonetics and phonemics of a language at a particular time pho*no*log*i*cal also  pho*no*log*ic  adj pho*no*log*i*cal*ly adv 
 
   
 
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