/ Dictionary / Index N nulli-: Meaning and Definition of Find definitions for: nulli- Pronunciation: [key] a combining form meaning “none,” “null”: nullipara. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. null hypothesis nullification 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