/ Dictionary / Index E extension cord: Meaning and Definition of Find definitions for: exten'sion cord" Pronunciation: [key] — Elect. Elect. an electric cord having a standard plug at one end and a standard electric jack at the other. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. extension bolt extension courses Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language