Debenture n. : A writing acknowledging a debt; a writing or certificate signed by a public officer, as evidence of a debt due to some person; the sum thus due.

Debenture n. : A customhouse certificate entitling an exporter of imported goods to a drawback of duties paid on their importation.

Example:
I received a convertible Debenture with 2011 maturity. How can I sell it?

Taxonomy
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Defination from the web:
debenture is a document that either creates a debt or acknowledges it. ... The organizers of the Wimbledon Tennis Championships, The All England Club, issue their debenture holders with a pair of tickets for each day of the tournament. ...