The state or quality of being able to be perfected.

plural of key performance indicator

plural of perfect metal

(chemistry, obsolete) Any metal, such as gold or silver, not readily oxidized by heat and air.

(Christianity) Advice as to a means of striving for moral perfection.

Correct in every word. / (UK, theater) Having memorized one's lines perfectly.

An artist (musician, actor, painter, etc), who performs in a public place, usually for donated money.

Without singing or playing any musical notes out of tune or incorrectly.

(music) A performance of an opera or similar piece without the normal dramatic action, or of a religious piece without the accompanying liturgy

present participle of self-perfect