GNU Collaborative International Dictionary of English

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Found one definition

1.       
   hifi, hi-fi [shortening of high fidelity.] n. An electronic device that plays phonograph records, reproducing the original sound with a high degree of fidelity.  It superseded the older phonographs, and itself is being displaced in popularity by CD players.
   
   Syn. -- hi-fi, high fidelity sound system.
   
   [WordNet 1.5 +PJC]