hi-fi

high fidelity sound system noun equipment for the reproduction of sound with high fidelity
Found on https://www.encyclo.co.uk/local/20974

hi-fi

Faithful reproduction of sound. Advances in mechanical equipment and electronics, such as digital recording techniques and compact discs, have made it possible to eliminate many distortions in sound-reproduction processes
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0016342.html

hi-fi

[n] - equipment for the reproduction of sound with high fidelity
Found on http://www.webdictionary.co.uk/definition.php?query=hi-fi