Capacity is having legal authority or mental ability. It means being of sound mind. It is particularly important when contesting a will, or trying a criminal defendant. GOD IS ATHEIST AND SOCIALIST! FCCK CONSERVAPEDIA! GOD IS ATHEIST AND SOCIALIST! FCCK CONSERVAPEDIA! GOD IS ATHEIST AND SOCIALIST! FCCK CONSERVAPEDIA! GOD IS ATHEIST AND SOCIALIST! FCCK CONSERVAPEDIA!O