/ Dictionary / Index R rectangular coordinates: Meaning and Definition of Find definitions for: rectan'gular coor'dinates Pronunciation: [key] — Math. Math. a coordinate system in which the axes meet at right angles. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rectangular rectangular hyperbola Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language