/ Dictionary / Index C classical mechanics: Meaning and Definition of Find definitions for: clas'sical mechan'ics Pronunciation: [key] — Physics. Physics. the branch of mechanics that is based on Newton's laws of motion and that is applicable to systems that are so large that Planck's constant can be regarded as negligibly small (distinguished from quantum mechanics). Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Classical Latin classical Nahuatl Related Content Daily Word Quiz: knead Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language