Merriam-Webster's Collegiate® Dictionary, 11th Edition
ELSE
I. adverb
Etymology: Middle English elles, from Old English; akin to Latin alius other, alter other of two, Greek allos other Date: before 12th century
1. in a different manner or place or at a different time , in an additional manner or place or at an additional time , if not ; otherwise ,
II. adjective Date: before 12th century other :, being different in identity , being in addition