/ Dictionary / Index W weight for age: Meaning and Definition of Find definitions for: weight' for age' Pronunciation: [key] — Horse Racing. Horse Racing. the poundage assigned to be borne by a horse in a race, based on the age of the horse. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. weighted mean weightism Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language