/ Dictionary / Index L lead time: Meaning and Definition of Find definitions for: lead' time" Pronunciation: (lēd), [key] the period of time between the initial phase of a process and the emergence of results, as between the planning and completed manufacture of a product. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lead tetraethyl lead track Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language