from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Either of the two bands of frequencies, one just above and one just below a carrier frequency, that result from modulation of a carrier wave.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The band of frequencies each side of the frequency of a carrier wave; formed as a result of modulation of the carrier.
side + band (Wiktionary)