/ Dictionary / Index P PABX: Meaning and Definition of Find definitions for: PABX Pronunciation: [key] an automatically operated PBX. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pabulum pac Related Content Daily Word Quiz: overture Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language