How do you spell Unconscious

Available Definitions:
1)  a. - Not conscious; having no consciousness or power of mental perception; without cerebral appreciation; hence, not knowing or regarding; ignorant; as, an unconscious man.
2)  a. - Not known or apprehended by consciousness; as, an unconscious cerebration.
3)  a. - Having no knowledge by experience; -- followed by of; as, a mule unconscious of the yoke.