hi-fi

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hi-fi

Informal
1. 
a. short for high fidelity
b. (as modifier): hi-fi equipment
2. a set of high-quality sound-reproducing equipment

hi-fi

[′hī′fī]
(engineering acoustics)

hi-fi

(HIgh-FIdelity) Generally refers to stereo systems and the audio side of home theater systems. The term originated back in the 1950s as audio equipment began to reproduce sound that was more realistic. Contrast with lo-fi. See stereo system and home theater.