"bound by indenture," 1748 (in indentured servant), past-participle adjective from indenture (v.).
Entries linking to indentured
indenture v.
1650s, "enter into a covenant;" 1670s, "bind by indenture," from indenture (n.). It was used earlier in a sense "to wrinkle, furrow" (1630s). Related: indentured; indenturing.