/ Dictionary / Index P PL/1: Meaning and Definition of Find definitions for: PL/1 Pronunciation: (pē'el"wun'), [key] a high-level programming language that is designed for solving problems in science and engineering as well as in business data processing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. PL PLA Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language