/ Dictionary / Index N null-space: Meaning and Definition of Find definitions for: null-space Pronunciation: (nul'spās"), [key] — n. Math. the set of elements of a vector space that a given linear transformation maps to zero. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: null-space (Thesaurus) null sequence Num. Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language