(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, home theater and hi-fi streaming.
Origin of hi-fi
American Heritage Dictionary of the English Language, 5th Edition
Shortened form of high fidelity.
Hi-fi Sentence Examples
While most styles are more masculine and boxy, Wolfpak, Digit, and Hi-Fi have a narrower, rounder silhouette.
Before the Kaiser's achieved worldwide success, the boys were prominent figures of the Leeds indie scene, and were the original hosts of Pigs, the city's monthly ostentatious electro-punk night at the Hi-Fi club in the city centre.
Know your audience: if your users aren't likely to have high-speed internet, then streaming hi-fi or large file downloads will probably not work well.
Unless, of course, you don't care for that sort of thing and like the days of Hi-Fi.