/ Dictionary / Index H humming: Meaning and Definition of Find definitions for: hum•ming Pronunciation: (hum'ing), [key] — adj. making a droning sound; buzzing. very busy; briskly active: a humming office. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: humming (Thesaurus) hummer hummingbird Related Content Daily Word Quiz: plausible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language