Synonyms of customary

adjectiveIn accordance with, or established by, custom or common usage.

• conventionalPertaining to a convention, as in following generally accepted principles, methods and behaviour.
• habitualRegular or usual.
• traditional
• halal figurativelyIn accordance with standards or usual practice; allowable.
• homodoxConforming to accepted standards or beliefs.
• kosher figurativelyIn accordance with standards or usual practice.
• orthodoxAdhering to whatever is customary, traditional, or generally accepted.
• by the book
• allowed
• naturalAs expected; reasonable, normal; naturally arising from the given circumstances.
• official
• properFollowing the established standards of behavior or manners; correct or decorous.
• routineAccording to established procedure.