In this Act—
Definition rep. by 1986 NI 4
“mental abnormality” means an abnormality of mind which arises from a condition of arrested or retarded development of mind or any inherent causes or is induced by disease or injury;
“insane person” means a person who suffers from mental abnormality which prevents him—
from appreciating what he is doing; or
from appreciating that what he is doing is either wrong or contrary to law; or
from controlling his own conduct; and
“insanity” shall be construed accordingly.