indenture
noun [ C ]
uk/ɪnˈdentʃər/ us FINANCE
a written agreement that states the rights and responsibilities of a company that sells a bond and someone who buys it:
The securities were issued under an indenture, dated as of June 1, 2009.
an indenture trustee.
especially in the past, a formal agreement that someone will work for someone else for a particular length of time, especially in order to learn a job:
On the completion of his indenture, he continued to attend night school.
The apprenticeship indentures were signed by the guild master and the apprentice's guardian.