/ Dictionary / Index Z zero tillage: Meaning and Definition of Find definitions for: ze'ro till'age Pronunciation: [key] no-tillage. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. zeroth law of thermodynamics zero vector Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language