Either

Either/or means "one or the other (of two)." Its usage, versus the simple or structure, is often for emphatic purposes, sometimes intending to emphasize that only one option is possible, or to emphasize that there are only two options. Its use in a sentence lets the reader/listener know in advance that a list of two or more possibilities will be..
Found on http://en.wikipedia.org/wiki/Either

either

[adv] - after a negative statement used as an intensive meaning something like `likewise` or `also`
Found on http://www.webdictionary.co.uk/definition.php?query=either

Either

Ei'ther (ē'&thlig;ẽr or ī'&thlig;ẽr; 277) adjective & pron. [ Middle English either , aither , Anglo-Saxon ǣgðer , ǣghwæðer (akin to Old High German ēogiwedar , Middle High German iegeweder ); &#x
Found on http://www.encyclo.co.uk/webster/E/15

Either

Ei'ther conj. Either precedes two, or more, coördinate words or phrases, and is introductory to an alternative. It is correlative to or . « Either he is talking, or he is pursuing, or he is in a journey, or peradventure he sleepeth.» 1 Kings xviii.
Found on http://www.encyclo.co.uk/webster/E/15

either

1. One of two; the one or the other; properly used of two things, but sometimes of a larger number, for any one. 'Lepidus flatters both, Of both is flattered; but he neither loves, Nor either cares for him.' (Shak) 'Scarce a palm of ground could be gotten by either of the three.' (Bacon) 'There have been three talkers in Great British, either of wh
Found on http://www.mondofacto.com/facts/dictionary?either

either

adverb after a negative statement used as an intensive meaning something like `likewise` or `also`; `he isn`t stupid, but he isn`t exactly a genius either`; `I don`t know either`; `if you don`t order dessert I won`t either`
Found on http://wordnetweb.princeton.edu/perl/webwn?s=either

Either

• (a. & pron.) Each of two; the one and the other; both; -- formerly, also, each of any number. • (conj. Either) precedes two, or more, coordinate words or phrases, and is introductory to an alternative. It is correlative to or. • (a. & pron.) One of two; the one or the other; -- properly used of two things, but sometimes of a larger
Found on http://thinkexist.com/dictionary/meaning/either/
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