An understanding between entities to follow a specific course of conduct.
Rules 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.
A legally binding contract enforceable in a court of law.
A state whereby several parties share a view or opinion; the state of not contradicting one another.
An expression granting permission; an indication of agreement with a proposal; an acknowledgement that a person, thing, or event meets requirements.
Something mailed by a seller to a collector to match their stated interests; the collector can approve of or return the item.
An expression of favorable acceptance and encouragement; a compliment that also condones.