/ Dictionary / Index L Lagrangian function: Meaning and Definition of Find definitions for: La•gran'gi•an func"tion Pronunciation: (lu-grān'jē-un), [key] — Physics. Physics. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Lagrange's theorem Lagrangian point Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language