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.
A competitor or team that is allowed to compete in a tournament despite not reaching the normal standards to qualify for inclusion.
A card that can be assigned any value or used to substitute for any needed card.