/ Dictionary / Index L long wave: Meaning and Definition of Find definitions for: long' wave" Pronunciation: [key] an electromagnetic wave over 60 meters in length. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. longwall longways Related Content Daily Word Quiz: menagerie Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language