opus

noun2

1. •
   A work of music or set of works with a specified rank in an ordering of a composer's complete published works.

   • Beethoven's "Razumovsky" Quartets, Op. 59, are considered by many to be the beginning of the Romantic era.
2. •
   A work, especially of art.

   • The painter's last opus was a dedication to all things living, in a surprising contrast to all of his prior work.