/ Dictionary / Index O oncogenesis: Meaning and Definition of Find definitions for: on•co•gen•e•sis Pronunciation: (ong"ku-jen'u-sis), [key] — n. the generation of tumors. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. oncogene oncogenicity Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language