noun, plural li·bret·tos, li·bret·ti [li-bret-ee] /lɪˈbrɛt i/.
- the text or words of an opera or similar extended musical composition.
- a book or booklet containing such a text.
noun plural -tos or -ti (-tiː)
- a text written for and set to music in an opera, etc
n.(plural libretti), 1742, from Italian libretto, diminutive of libro “book,” from Latin liber (genitive libri), see library. Related: Librettist.