Dictionary.com
definitions

L'Allegro

[lah-ley-groh, la-]
noun
  1. a poem (1632) by John Milton.
Compare Il Penseroso.

Allegro, L'

[lah-ley-groh, la-]
noun
  1. L'Allegro.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018