/ Dictionary / Index N null sequence: Meaning and Definition of Find definitions for: null' se"quence Pronunciation: [key] — Math. Math. a sequence that has zero as its limit. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nullo null-space 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