from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Informal High fidelity.
- n. Informal An electronic system for reproducing high-fidelity sound from radio or recordings.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. high fidelity
hi(gh) + fi(delity).(American Heritage® Dictionary of the English Language, Fourth Edition)
Shortened form of high fidelity. (Wiktionary)