/ Dictionary / Index V vector sum: Meaning and Definition of Find definitions for: vec'tor sum" Pronunciation: [key] — Math. Math. the vector obtained by applying vector addition to two or more given vectors. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. vector space vecture 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