Webster's Revised Unabridged Dictionary · 1913

Else

Else , adjective and pronoun

[Old English & Anglo-Saxon elles otherwise, gen. sing. of an adj. signifying other; akin to Old High German elles otherwise, OSw. aljes, Swedish eljest, Gothic aljis, adj., other, Latin alius, Greek {not transcribed}. Compare Alias, Alien.]

Other; one or something beside; as, Who else is coming? What else shall I give? Do you expect anything else?
Bastards and else. — Shakespeare

This word always follows its noun. It is usual to give the possessive form to else rather than to the substantive; as, somebody else's; no one else's. “A boy who is fond of somebody else's pencil case.” G. Eliot. “A suit of clothes like everybody else's.” Thackeray.

Else , adverb and conjunction

1.
Besides; except that mentioned; in addition; as, nowhere else; no one else.
2.
Otherwise; in the other, or the contrary, case; if the facts were different.
For thou desirest not sacrifice; else would I give it. — Bible (KJV) - Psalm li. 16

After ‘or', else is sometimes used expletively, as simply noting an alternative. “Will you give thanks,... or else shall I?”