noun
He is master of all he surveys. Decisions about punishment are referred to the master
He is a master in the art of chicanery
She studied under the master for years
adjective
After twenty years, he became a master craftsman
Only the leader knows the master plan for conquering the planet. This is the master switch that turns off all the power
The master bedroom had a bathroom en suite
verb
He claims to have mastered the art of levitation
You must learn to master your emotions