/ Dictionary / Index A abscissa: Meaning and Definition of Find definitions for: ab•scis•sa Pronunciation: (ab-sis'u), [key] — pl. -scis•sas, -scis•sae (in plane Cartesian coordinates) the x-coordinate of a point: its distance from the y-axis measured parallel to the x-axis. Cf. ordinate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: abscissa (Thesaurus) abscisic acid abscission Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language