/ Dictionary / Index Z zero-zero: Meaning and Definition of Find definitions for: ze•ro-ze•ro Pronunciation: (zēr'ō-zēr'ō), [key] — adj. Meteorol. (of atmospheric conditions) having or characterized by zero visibility in both horizontal and vertical directions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. zero vector Zerubbabel Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language