Pronunciation: (mas'tur-pēs", mä'stur-),[key] —n. 1. a person's greatest piece of work, as in an art.
2. anything done with masterly skill: a masterpiece of improvisation. 3. a consummate example of skill or excellence of any kind: The chef 's cake was a masterpiece. 4. a piece made by a person aspiring to the rank of master in a guild or other craft organization as a proof of competence.