/ Dictionary / Index M molecularity: Meaning and Definition of Find definitions for: mo•lec•u•lar•i•ty Pronunciation: (mu-lek"yu-lar'i-tē), [key] — n. Chem. the number of molecules or atoms that participate in an elementary process. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. molecular genetics molecular knife Related Content Daily Word Quiz: leonine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language