/ Dictionary / Index L L'Allegro*: Meaning and Definition of Find definitions for: L'Al•le•gro Pronunciation: (lä-lā'grō, la-), [key] — n. a poem (1632) by John Milton. Cf. Il Penseroso. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lallation Lally column Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language