/ Dictionary / Index P prelaunch: Meaning and Definition of Find definitions for: pre•launch Pronunciation: (prē-lônch', -länch'), [key] — adj. preparatory to launch, as of a spacecraft. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. prelature prelease Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language