Pre-agreement

noun
1.
the act of agreeing or of coming to a mutual arrangement.
2.
the state of being in accord.
3.
an arrangement that is accepted by all parties to a transaction.
4.
a contract or other document delineating such an arrangement.
5.
unanimity of opinion; harmony in feeling:
agreement among the members of the faculty.
6.
Grammar. correspondence in number, case, gender, person, or some other formal category between syntactically connected words, especially between one or more subordinate words and the word or words upon which they depend; selection by one word of the matching formal subclass, or category, in another word syntactically construed with the first.
7.
collective agreement.
8.
Law.

an expression of assent by two or more parties to the same object.
the phraseology, written or oral, of an exchange of promises.

noun
1.
the act of agreeing
2.
a settlement, esp one that is legally enforceable; covenant; treaty
3.
a contract or document containing such a settlement
4.
the state of being of the same opinion; concord; harmony
5.
the state of being similar or consistent; correspondence; conformity
6.
(grammar) Also called concord. the determination of the inflectional form of one word by some grammatical feature, such as number or gender, of another word, esp one in the same sentence
7.
See collective agreement, national agreement

agreement definition

A requirement for parts of a sentence in standard written English; the parts must agree, for example, in number and person.

The subject and verb of a clause or simple sentence must agree in person, as in “He is a boy.” The subject, he, and the verb, is, are both in the third person. The subject and verb also must agree in number, as in “We are girls.” The subject, we, and the verb, are, are both plural.

Nouns and pronouns must also agree in number, person, and gender as in “Every boy must mind his manners.” The noun boy and the pronoun his are both singular, both in the third person, and both masculine.
agreement