1. A deed or agreement produced in two or more copies with edges correspondingly indented as a means of identification.
2. Any deed, written contract, or sealed agreement.
3. A contract by which a person; such as, an apprentice, is bound to service.
4. Any official or formal list, certificate, etc., authenticated for use as a voucher or the like.
5. The formal agreement between a group of bondholders and the debtor as to the terms of the debt.
6. Etymology: Old French endenture, "an indented document", from endenter "to indent" (divide a document into sections with irregular edges that can be matched for authentication), from en- "thoroughly" + dent, "tooth".

To bind someone with a contract to work for another person, under specified conditions, for a specified time; usually, as an apprentice.