Merriam-Webster's Collegiate® Dictionary, 11th Edition
OTHERWISE
I. pro noun
Etymology: Middle English, from Old English (on) ōthre wīsan in another manner Date: before 12th century something or anything else ; something to the contrary ,
II. adverb
Date: 13th century
in a different way or manner , in different circumstances , in other respects , if not , not ,
III. adjective
Date: 14th century
different