/ Dictionary / Index P pro rata: Meaning and Definition of Find definitions for: pro ra•ta Pronunciation: (prō rā'tu, rä'-), [key] in proportion; according to a certain rate. pro-ra•ta Pronunciation: (prō-rā'tu, -rä'-), [key] — adj. proportionately determined: a pro-rata share of income. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. propylthiouracil prorate Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language