/ Dictionary / Index A Abu-Bakr: Meaning and Definition of Find definitions for: A•bu-Bakr Pronunciation: (u-b"bak'ur), [key] — n. a.d. 573–634, Muhammad's father-in-law and successor: first caliph of Mecca 632–634. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. abt. abubble Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language