/ Dictionary / Index L linear accelerator: Meaning and Definition of Find definitions for: lin'ear accel'erator Pronunciation: [key] — Physics. Physics. an accelerator in which particles are propelled in straight paths by the use of alternating electric voltages that are timed in such a way that the particles receive increasing increments of energy. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Linear A linear algebra Related Content Daily Word Quiz: braggart Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language