assent

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

• intransitive verb To express agreement or acceptance, as of a proposal.
• noun Agreement; concurrence.
• noun Acquiescence; consent.

from The Century Dictionary.

• To admit a proposition as true; express an agreement of the mind to what is alleged or proposed; concur; acquiesce: with to before an object.
• Synonyms To agree, subscribe.
• To agree to; approve; determine.
• noun The act of the mind in admitting or agreeing to the truth of a proposition proposed for acceptance.
• noun Consent; concurrence; acquiescence; agreement to a proposal: as, the bill before the house has the assent of a great majority of the members.
• noun Accord; agreement; approval.
• noun Opinion.

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

• transitive verb To admit a thing as true; to express one's agreement, acquiescence, concurrence, or concession.
• noun The act of assenting; the act of the mind in admitting or agreeing to anything; concurrence with approval; consent; agreement; acquiescence.
• noun in England, the assent of the sovereign to a bill which has passed both houses of Parliament, after which it becomes law.

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

• verb To agree to, give approval to.
• noun agreement, act of agreeing

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

• verb to agree or express agreement
• noun agreement with a statement or proposal to do something