/ Dictionary / Index I internal resistance: Meaning and Definition of Find definitions for: inter'nal resist'ance Pronunciation: [key] — Elect. Elect. the resistance within a battery, or other voltage source, that causes a drop in the source voltage when there is a current. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. internal relation internal revenue Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language