Indenture
WordNet
noun
(1) The space left between the margin and the start of an indented line
(2) A contract binding one party into the service of another for a specified term
(3) Formal agreement between the issuer of bonds and the bondholders as to terms of the debt
(4) A concave cut into a surface or edge (as in a coastline)
verb
(5) Bind by or as if by indentures, as of an apprentice or servant
"An indentured servant"