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American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To pledge or contribute (a sum of money).
2. v. To sign (one's name) at the end of a document.
3. v. To sign one's name to in attestation, testimony, or consent: subscribe a will.
4. v. To authorize (someone) to receive or access electronic texts or services, especially over the Internet.
5. v. 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.
6. v. To receive or be allowed to access electronic texts or services by subscription.
7. v. To promise to pay or contribute money: subscribe to a charity.
8. v. To feel or express hearty approval: I subscribe to your opinion. See Synonyms at assent.
9. v. To sign one's name.
10. v. To affix one's signature to a document as a witness or to show consent.

Century Dictionary and Cyclopedia

1. To write beneath: said of what is so written or of the handwriting.
2. Hence To sign with one's own hand.
3. 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.
4. To attest by writing one's name beneath.
5. To promise to give or pay, by writing one's name under a written or printed agreement: as, each subscribed $10.
6. To resign; transfer by signing to another.
7. To write down or characterize as.
8. 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.
9. To give consent; assent as if by signing one's name.
10. To yield; submit.

Wiktionary

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

GNU Webster's 1913

1. v. To write underneath, as one's name; to sign (one's name) to a document.
2. v. 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.
3. v. To attest by writing one's name beneath.
4. v. To promise to give, by writing one's name with the amount.
5. v. obsolete To sign away; to yield; to surrender.
6. v. obsolete To declare over one's signature; to publish.
7. v. To sign one's name to a letter or other document.
8. v. To give consent to something written, by signing one's name; hence, to assent; to agree.
9. v. rare To become surely; -- with for.
10. v. obsolete To yield; to admit one's self to be inferior or in the wrong.
11. v. To set one's name to a paper in token of promise to give a certain sum.
12. v. To enter one's name for a newspaper, a book, etc.

WordNet 3.0

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