Definition of "Agreement" :

noun: compatibility of observations

"There was no agreement between theory and measurement."

noun: the thing arranged or agreed to

noun: the statement (oral or written) of an exchange of promises

"They had an agreement that they would not interfere in each other's business."

noun: the verbal act of agreeing

noun: the determination of grammatical inflection on the basis of word relations

noun: harmony of people's opinions or actions or characters

"The two parties were in agreement."