from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Other; different: Ask somebody else.
- adj. Additional; more: Would you like anything else?
- adv. In a different or additional time, place, or manner: I always do it this way and I don't know how else it could be done. Where else do you want to go besides Miami?
- adv. If not; otherwise: Be careful, or else you will make a mess.
- idiom or else Regardless of any extenuating circumstances: Be there on time or else!
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Other; in addition to previously mentioned items.
- adv. Otherwise, if not.
- conj. For otherwise; or else.
- conj. but if the condition of the previous if clause is false, do the following.
from the GNU version of the Collaborative International Dictionary of English
- adj. Other; one or something beside
- adv. Besides; except that mentioned; in addition
- adv. Otherwise; in the other, or the contrary, case; if the facts were different.
from The Century Dictionary and Cyclopedia
- In another or a different manner; in some other way; to a different purpose; otherwise.
- In another or a different case; if the fact were different; otherwise.
- Besides; other than the person, thing, place, etc., mentioned: after an interrogative or indefinite pronoun, pronominal adjective, or adverb (who, what, where, etc., anybody, anything, somebody, something, nobody, nothing, all, little, etc.), as a quasi-adjective, equivalent to other: as, who else is coming? what else shall give you? do you expect anything else?
- [The phrases anybody else, somebody else, nobody else, etc., have a unitary meaning, as if one word, and properly take a possessive case (with the suffix at the end of the phrase): as, this is somebody else's hat; nobody else's children act so.]
Middle English elles, from Old English.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English, from Old English elles ("other, otherwise, different"), from Proto-Germanic *aljas (“of another, of something else”), genitive of *aljaz (“other”), from Proto-Indo-European *h₂elios, *al- (“other”, pronoun). Cognate with Old Frisian elles ("other"), Old High German elles, ellies ("other"), Danish eller ("or"), Danish ellers ("otherwise"), Swedish eljes, eljest ("or else, otherwise"), Norwegian elles ("else, otherwise"), Gothic 𐌰𐌻𐌾𐌹𐍃 (aljis, "other"), Latin alius ("other, another"), Ancient Greek ἄλλος (állos), αἶλος (Arcadocypriot), (Modern Greek αλλιώς (alliṓs, "otherwise, else")). (Wiktionary)