Adolescence /ˌæd

master /ˈmɑː.stə r / /ˈmæs.tɚ/ noun [ C ] SKILLED PERSON
2. a person who is very skilled in a particular job or activity
He was a master of disguise.
3. a famous and very skilled painter
This painting is clearly the work of a master.
master /ˈmɑː.stə r / /ˈmæs.tɚ/ noun [ C ] CONTROLLER
1. a person who has control over or responsibility for someone or something, or who is the most important or influential (= having most influence) person in a situation or organization
old-fashioned a slave and his master
With careful training, a dog will obey its master completely.
UK The Master of St. John's College will be launching the appeal.