/ Dictionary / Index P parallel postulate: Meaning and Definition of Find definitions for: par'allel pos'tulate Pronunciation: [key] — Geom. Geom. the axiom in Euclidean geometry that only one line can be drawn through a given point so that the line is parallel to a given line that does not contain the point. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. parallelogram law parallel projection Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language