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.
The relation of sharing properties.
A transformation that preserves angles and the ratios of distances
The property of two matrices being similar.
Closeness of appearance to something else.