/ Dictionary / Index P proportional counter: Meaning and Definition of Find definitions for: propor'tional count'er Pronunciation: [key] — Physics. Physics. a radiation counter in which the strength of each electric pulse generated per count is proportional to the energy of the particle or photon producing the pulse, alpha particles producing a different electric pulse from beta rays. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. proportional proportional limit Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language