A word which has the opposite meaning of another word.
A word that describes one end of a scale, while its opposite describes the other end, such as large versus small; a gradable antonym.
The difference between the rank of a matrix and the number of columns it has; the dimension of the nullspace of a matrix.
A void act; a defective proceeding or one expressly declared by statute to be a nullity.
The state of being null, or void, or invalid.