- Apprentice :
A person who is learning a craft or trade by working for, and being taught by, a master or expert in that trade for an agreed period. They usually work for low wages until the apprenticeship is ended.
- Apprenticeship :
The period during which a person is bound (under contract) as an apprentice
- Indenture :
A form of contracted servitude or apprenticeship for a fixed period of time.