Etude
/ˈeɪtuːd/
Definition 1 of 1
Pro Tip 1/3Music Practice
Etudes are musical pieces focusing on perfecting skills, not full concert performances. 
She played an etude every morning to improve her finger agility on the cello.
Pro Tip 2/3Composer's Intent
Composers write etudes to challenge and develop a musician's ability with specific techniques. 
The Chopin etudes test a pianist's precision and expression extensively.
Pro Tip 3/3Not Performance Piece
While etudes can be performed, they're primarily meant for personal skill enhancement. 
His recital included a Chopin etude, showcasing his technical progress.