The definition of else is a different person or thing, or something more.(adjective)
Else is defined as in a different way, place or time.(adverb)
An example of else is blowing up a balloon with a different gas; what else can I use?
See else in Webster's New World College Dictionary
Origin: ME & OE elles, adv. gen. of n. base el-, other (as in OE el-land, foreign land), akin to Goth aljis, OHG elles, of same formation < IE base *al-, that, yonder one > L alius, another, alienus, belonging to another, Gr allos, other
See else in American Heritage Dictionary 4
Origin: Middle English elles
Origin: , from Old English; see al-1 in Indo-European roots. Usage Note: Else is often used redundantly in combination with prepositions such as but, except, and besides. The sentence No one else but Sam saw the accident would thus be better without else. • When a pronoun is followed by else, the possessive form is generally written with the 's following else: That must be someone else's (not someone's else) book. Both who else's and whose else are in use, but not whose else's: Who else's book could it have been? Whose else could it have been? See Usage Notes at who, whose.
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