/ Dictionary / Index A atop: Meaning and Definition of Find definitions for: a•top Pronunciation: (u-top'), [key] — adj., adv. on or at the top. —prep. on the top of: atop the flagpole. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: atop (Thesaurus) atony atopic Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language