/ Dictionary / Index C conjectural: Meaning and Definition of Find definitions for: con•jec•tur•al Pronunciation: (kun-jek'chur-ul), [key] — adj. of, of the nature of, or involving conjecture; problematical: Theories about the extinction of dinosaurs are highly conjectural. given to making conjectures: a conjectural thinker. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: conjectural (Thesaurus) conj. conjecture Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language