/ Dictionary / Index N null hypothesis: Meaning and Definition of Find definitions for: null' hypoth"esis Pronunciation: [key] (in the statistical testing of a hypothesis) the hypothesis to be tested. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nulla-nulla nulli- 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