guarantee

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Something that assures a particular outcome or condition: Lack of interest is a guarantee of failure.
2. n. A promise or an assurance, especially one given in writing, that attests to the quality or durability of a product or service.
3. n. A pledge that something will be performed in a specified manner.
4. n. A guaranty by which one person assumes responsibility for paying another's debts or fulfilling another's responsibilities.
5. n. A guaranty for the execution, completion, or existence of something.
6. n. A guarantor.
7. v. To assume responsibility for the debt, default, or miscarriage of.
8. v. To assume responsibility for the quality or performance of: guarantee a product.
9. v. To undertake to do, accomplish, or ensure (something) for another: guaranteed to free the captives; guarantees freedom of speech.
10. v. To make certain: The rain guarantees a good crop this year.
11. v. To furnish security for.
12. v. To express or declare with conviction: I guarantee that you'll like this book.

Century Dictionary and Cyclopedia

1. n. A person to whom a guaranty is given: the correlative of guarantor.
2. n. One who binds himself to see the stipulations or obligations of another performed; in general, one who is responsible for the performance of some act, the truth of some statement, etc.
3. n. Same as guaranty.
4. To be warrant or surety for; secure as an effect or consequence; make sure or certain; warrant.
5. In law, to bind one's self that the obligation of another shall be performed, or that something affecting the right of the person in whose favor the guaranty is made shall be done or shall occur. To guarantee a contract or an undertaking by another is to bind one's self that it shall be performed or carried out. To guarantee the collection of a debt is to bind one's self to pay it if it proves not collectible by ordinary means. To guarantee any subject of a business transaction is to make one's self legally answerable for its being exactly as represented: as, the seller guaranteed the quality of the goods; the carrier gave a bill of lading with the words “quantity guaranteed” (meaning that he stipulated to be answerable for the quantity specified, without any further question or dispute as to amount).
6. To undertake to secure to another, as claims, rights, or possessions; pledge one's self to uphold or maintain.
7. To engage to indemnify for or protect from injury: as, to guarantee one against loss.

Wiktionary

1. n. Anything that assures a certain outcome.
2. n. A written declaration that a certain product will be fit for a purpose and work correctly.
3. n. A person who gives such a guarantee; a guarantor.
4. v. To assure that something will get done right.
5. v. To assume responsibility for a debt.
6. v. To make something certain.

GNU Webster's 1913

1. n. In law and common usage: A promise to answer for the payment of some debt, or the performance of some duty, in case of the failure of another person, who is, in the first instance, liable to such payment or performance; an engagement which secures or insures another against a contingency; a warranty; a security. Same as guaranty.
2. n. One who binds himself to see an undertaking of another performed; a guarantor.
3. n. (Law) The person to whom a guaranty is made; -- the correlative of guarantor.
4. v. In law and common usage: to undertake or engage for the payment of (a debt) or the performance of (a duty) by another person; to undertake to secure (a possession, right, claim, etc.) to another against a specified contingency, or in all events; to give a guarantee concerning; to engage, assure, or secure as a thing that may be depended on; to warrant.

WordNet 3.0

1. v. give surety or assume responsibility
2. v. make certain of
3. n. a written assurance that some product or service will be provided or will meet certain specifications
4. v. promise to do or accomplish
5. n. a collateral agreement to answer for the debt of another in case that person defaults
6. n. an unconditional commitment that something will happen or that something is true
7. v. stand behind and guarantee the quality, accuracy, or condition of