(1):

(conj.) Unless; if it be not so that.

(2):

(v. i.) To take exception; to object; - usually followed by to, sometimes by against; as, to except to a witness or his testimony.

(3):

(prep.) With exclusion of; leaving or left out; excepting.

(4):

(v. t.) To take or leave out (anything) from a number or a whole as not belonging to it; to exclude; to omit.

(5):

(v. t.) To object to; to protest against.