subscribe

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To pledge or contribute (a sum of money).
• intransitive verb To sign (one's name) at the end of a document, especially to attest to or authenticate it.
• intransitive verb To sign one's name to (a document) in attestation, testimony, or consent.
• intransitive verb To authorize (someone) to receive or access electronic texts or services, especially over the Internet.
• intransitive verb To purchase or claim the shares of (a new issue of stock, bonds, or other securities).
• intransitive verb To contract to receive and pay for a certain number of issues of a publication, for tickets to a series of events or performances, or for a utility service, for example.
• intransitive verb To receive or be allowed to access electronic texts or services by subscription.
• intransitive verb To promise to pay or contribute money.
• intransitive verb To purchase or claim shares of a new issue of stock, bonds, or other securities.
• intransitive verb To feel or express hearty approval: synonym: assent.
• intransitive verb To sign one's name to a document.

from The Century Dictionary.

• To write beneath: said of what is so written or of the handwriting.
• Hence To sign with one's own hand.
• By extension To give consent to, as to something written, or to bind one's self to, by Writing one's name beneath: as, to subscribe a covenant or contract. In law subscribe implies a written or printed signature at the end of a document. See sign, 2.
• To attest by writing one's name beneath.
• To promise to give or pay, by writing one's name under a written or printed agreement: as, each subscribed $10.
• To resign; transfer by signing to another.
• To write down or characterize as.
• To promise a certain sum verbally, or by signing an agreement; specifically, to undertake to pay a definite amount, in a manner or on conditions agreed upon, for a special purpose: as, to subscribe for a newspaper or for a book (which may be delivered in instalments); to subscribe to a series of entertainments; to subscribe for railway stock; also, to contribute money to any enterprise, benevolent object, etc. In law the word implies that the agreement is made in writing.
• To give consent; assent as if by signing one's name.
• To yield; submit.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To write underneath, as one's name; to sign (one's name) to a document.
• transitive verb To sign with one's own hand; to give consent to, as something written, or to bind one's self to the terms of, by writing one's name beneath.
• transitive verb To attest by writing one's name beneath.
• transitive verb To promise to give, by writing one's name with the amount.
• transitive verb obsolete To sign away; to yield; to surrender.
• transitive verb obsolete To declare over one's signature; to publish.
• intransitive verb To sign one's name to a letter or other document.
• intransitive verb To give consent to something written, by signing one's name; hence, to assent; to agree.
• intransitive verb rare To become surely; -- with for.
• intransitive verb obsolete To yield; to admit one's self to be inferior or in the wrong.
• intransitive verb To set one's name to a paper in token of promise to give a certain sum.
• intransitive verb To enter one's name for a newspaper, a book, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb ergative To sign up to have copies of a publication, such as a newspaper or a magazine, delivered for a period of time.
• verb To pay for the provision of a service, such as Internet access or a cell phone plan.
• verb To believe or agree with a theory or an idea.
• verb To pay money to be a member of an organization.
• verb To contribute or promise to contribute money to a common fund.
• verb To agree to buy shares in a company.
• verb archaic To write one’s name at the bottom of a document, to sign.
• verb obsolete To sign away; to yield; to surrender.
• verb obsolete To yield; to admit to being inferior or in the wrong.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb offer to buy, as of stocks and shares
• verb mark with one's signature; write one's name (on)
• verb receive or obtain regularly
• verb adopt as a belief
• verb pay (an amount of money) as a contribution to a charity or service, especially at regular intervals