/ Dictionary / Index P position effect: Meaning and Definition of Find definitions for: posi'tion effect" Pronunciation: [key] — Genetics. Genetics. the alteration in the expression of a gene or genetic region due to its relocation within the genome as a result of inversion or translocation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. positional notation positioner Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language