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From Middle French nullité, from Medieval Latin nullitalis, from Latin nullus


nullity (countable and uncountable, plural nullities)

  1. The state of being null, or void, or invalid.
    nullity of marriage
  2. (law) A void act; a defective proceeding or one expressly declared by statute to be a nullity.
  3. (mathematics) The difference between the rank of a matrix and the number of columns it has; the dimension of the nullspace of a matrix.

Derived termsEdit