1.NounAn understanding between entities to follow a specific course of conduct.
"to enter an agreement; The UK and US negotiators were nearing agreement.; He nodded his agreement."
2.NounA state whereby several parties share a view or opinion; the state of not contradicting one another.
"The results of my experiment are in agreement with those of Michelson and with the law of General Relativity."
3.NounA legally binding contract enforceable in a court of law.
4.NounRules that exist in many languages that force some parts of a sentence to be used or inflected differently depending on certain attributes of other parts.