/ Dictionary / Index E effective resistance: Meaning and Definition of Find definitions for: effec'tive resist'ance Pronunciation: [key] — Elect. Elect. the resistance to an alternating current, expressed as the ratio of the power dissipated to the square of the effective current. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. effective dose effective sound pressure Related Content Daily Word Quiz: supercilious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language