Captive

Concise Oxford English Dictionary © 2008 Oxford University Press:
captive/ˈkaptɪv/

▶noun a person who has been taken prisoner or confined. ▶adjective

• 1 imprisoned or confined.

• 2 having no freedom to choose an alternative: a captive audience.

• 3 (of a facility or service) controlled by and reserved for a particular organization.

– derivatives
captivity noun (pl. captivities).

– origin ME: from L. captivus, from capere ‘seize, take’.