The crossword solution for the term 'NORMA' number is ARIA. An ARIA is a self-contained piece for one voice, with or without instrumental accompaniment, normally part of a larger work such as an opera, cantata, oratorio, or musical. It is usually a solo composition, and is often a prominent feature of the work. The term is also used to refer to a melodic passage or phrase from an opera, cantata, or oratorio.