1) Italian opera terminology 2) Italian musical term 3) Musical term to an Italian 4) Musical term in Rome 
A comprimario is a supporting role in an opera. Derived from the Italian `con primario`, or `with the primary`, the term refers to a performer who sings small role pieces. Many singers began their careers as comprimario singers; some have made a career out of singing such parts. Among these latter are singers such as Anthony Laciura, Jean Kraf...
a singer in an opera company who ranks below the lead singers and who usually sings secondary roles.
A secondary role in an opera.