else

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Other; different: Ask somebody else.
2. adj. Additional; more: Would you like anything else?
3. 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?
4. adv. If not; otherwise: Be careful, or else you will make a mess.
5. idiom. or else Regardless of any extenuating circumstances: Be there on time or else!

Century Dictionary and Cyclopedia

1. In another or a different manner; in some other way; to a different purpose; otherwise.
2. In another or a different case; if the fact were different; otherwise.
3. 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?
4. [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.]

Wiktionary

1. adj. Other; in addition to previously mentioned items.
2. adv. Otherwise, if not.
3. conj. For otherwise; or else.
4. conj. computing but if the condition of the previous if clause is false, do the following.

GNU Webster's 1913

1. adj. Other; one or something beside
2. adv. Besides; except that mentioned; in addition
3. adv. Otherwise; in the other, or the contrary, case; if the facts were different.