adj.
Pronunciation: ' el(t)s
Function: 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 a : in a different manner or place or at a different time <how else could he have acted> <here and nowhere else > b : in an additional manner or place or at an additional time <where else is gold found>
2 : if not : OTHERWISE <leave or else you'll be sorry> ― used absolutely to express a threat <do what I tell you or else >