/ Dictionary / Index P pitch plane: Meaning and Definition of Find definitions for: pitch' plane" Pronunciation: [key] — Mach. Mach. See under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pitch pipe pitchpole Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language