American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
WordNet
(3)
Elsewhere on the web
By the time he was eight or nine he started putting together his own hi-fi.— CNET News.com
David set up his ex girlfriend with a nice hi-fi, and she's getting into vinyl and tape.— CNET News.com
Fisher and Fisher Studio Series hi-fi products were definitely high end back in the 80's.— Epinions Recent Content for Home
Kids of today have no concept of hi-fi because they have been listening to Ipods for so long they think it is 'right'.— The Inquirer
Because stories about setting up hi-fi equipment have little appeal for people who aren't themselves merchants of tedium, I'll cut to the chase: To sound its best, the Sugden A21ai Series 2 needed lots of run-in and warmup.— Stereophile RSS Feed

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word a few times a year.
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