indenture

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

The space left between the margin and the start of an indented line.

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

Formal agreement between the issuer of bonds and the bondholders as to terms of the debt.

Bind by or as if by indentures, as of an apprentice or servant.

“an indentured servant”