subscriber

transitive verb subscribed -·scribed′, subscribing -·scrib′·ing

1. to sign (one's name) at the end of a document, etc.
2. to write one's signature on (a document, etc.) as an indication of consent, approval, attestation, etc.
3. to support; consent to; favor; sanction
4. to promise to contribute (a sum of money), esp. by signing a pledge

Etymology: ME subscriben < L subscribere: see sub- & scribe

intransitive verb

1. to sign one's name at the end of a document, etc.
2. to give support, sanction, or approval; consent or agree (to) to subscribe to certain measures
3. to promise to contribute, or to give, a sum of money
4. to register or be registered to pay for and receive a periodical, service, theater tickets, etc. for a specified period of time (with to)