IPA: /ˈæpənɪdʒ/
KK: /ˈæpəˌneɪdʒ/
A type of support or income, often in the form of land or money, given to a member of a royal family or a noble as a right or privilege.
The prince received an appanage to ensure his financial independence.
Appanage is derived from the Old French 'apanage' (meaning a provision or allowance), which itself comes from 'apaner' (meaning to provide or to give). The word refers to a grant of land or income for the support of a younger son or a member of a royal family.
Think of 'apaner' meaning to 'provide' — that's why appanage refers to a provision or allowance given to support someone.