How do you spell Dissection

Available Definitions:
1)  n. - The act of dissecting an animal or plant; as, dissection of the human body was held sacrilege till the time of Francis I.
2)  n. - Fig.: The act of separating or dividing for the purpose of critical examination.
3)  n. - Anything dissected; especially, some part, or the whole, of an animal or plant dissected so as to exhibit the structure; an anatomical so prepared.