Meaning

noun a concave cut into a surface or edge (as in a coastline)

noun formal agreement between the issuer of bonds and the bondholders as to terms of the debt

noun a contract binding one party into the service of another for a specified term

originFrom Anglo-Norman endenture, from Old French endenteure, from endenter (“to dent”). The name of the contract derives from the irregular dent-shaped cut (indentation) used to prove the authenticity of the two parts, similar to a chirograph.

Etymology from Wiktionary, CC BY-SA 3.0