/ Dictionary / Index P passband: Meaning and Definition of Find definitions for: pass•band Pronunciation: (pas'band", päs'-), [key] — n. Radio and Television. the range of frequencies that pass with a minimum of attenuation through an electronic filter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. passant passbook Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language