/ Dictionary / Index L Langley: Meaning and Definition of Find definitions for: Lang•ley Pronunciation: (lang'lē), [key] — n. See 1834–1906, U.S. astronomer, physicist, and pioneer in aeronautics. See a city in SW British Columbia, in SW Canada, near Vancouver. 15,124. lang•ley Pronunciation: (lang'lē), [key] — n. Physics. for electromagnetic radiation incident upon a surface, a value of energy per unit area equal to one calorie per square centimeter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: langley (Thesaurus) lang lay Langmuir Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language