Definitions of agreement:

• noun:   compatibility of observations

  Example: "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

  Example: "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

  Example: "The two parties were in agreement"