useless trivia: What Word Means: A Cadet?

Questions

(It.) - First.?

(It., 'first lady') - A female singer with the most important part in an opera.?

(It.) - First time.?

(It.) - First. (1) Upper part of a piano duet, the lower part being termed sccondo; (2) The first of two or more performers (e.g. violino primo means first violin). (3) Tempo primo indicates that the original speed is to be resumed.?

(It.) - The chief castrato or tenor role, used in the 18th century.?