Either

Determiner

 * 1) Each of two.
 * 2) * 1936, Djuna Barnes, Nightwood, Faber & Faber 2007, p. 31:
 * Her hands, long and beautiful, lay on either side of her face.
 * 1) One or the other of two.

Synonyms

 * both, each
 * both, each

Adverb

 * 1)  as well
 * I don't like him and I don't like her either.

Synonyms

 * neither
 * too

Conjunction

 * 1) Introduces the first of two options, the second of which is introduced by "or".
 * Either you eat your dinner or you go to your room.

Thesaurus
a certain, a deux, an, any, any one, anybody, anyone, anything, atomic, aught, both, correspondingly, exclusive, for two, identically, in kind, in like manner, in that way, individual, indivisible, integral, irreducible, like, like that, like this, likewise, lone, monadic, monistic, one, similarly, simple, single, singular, so, sole, solid, solitary, tete-a-tete, the two, thus, unanalyzable, undivided, uniform, unique, unitary, whole

Etymology
æghwæþer:, from West, ultimately corresponding to ay: + whether:

Determiner

 * Estonian: mõlemad
 * Finnish: ,
 * French:
 * Italian:


 * Polish:, obaj,  obie
 * Romanian: fiecare, amândoi
 * Russian:
 * Swedish: vardera, båda


 * Arabic: أي, واحد من إثنين
 * Chinese:
 * Mandarin: 兩者之一, 两者之一
 * Estonian: kumb
 * Finnish:
 * French: l'un ou l'autre, l'une ou l'autre (for two feminine nouns)
 * Italian: l'uno o l'altro, l'una o l'altra  (for two feminine nouns)


 * Japanese: どちらか
 * Polish: obojętnie który, którykolwiek
 * Romanian: oricare
 * Russian:, один из двух
 * Scots: ither
 * Spanish: cualquiera de los dos
 * Swedish: endera, vilken som

Pronoun

 * 1)  Both, each of two (people or things).
 * 2) * 1485, Sir Thomas Malory, Le Morte Darthur, Book VII:
 * Than ayther departed to theire tentis and made hem redy to horsebacke as they thought beste.
 * , III.i:
 * And either vowd with all their power and wit, / To let not others honour be defaste [...].
 * 1) One or other of two people or things.

Adverb

 * Arabic: أيضا, كذلك
 * Estonian: samuti
 * Finnish:, ,
 * French:
 * German:
 * Irish: ach a oiread


 * Italian:, ,
 * Polish: też nie
 * Romanian: nici
 * Russian: также не
 * Spanish:
 * Swedish:

Conjunction

 * Arabic: إما...أو...
 * Chinese:
 * Mandarin: 或者……或者…… (huòzhě...huòzhě...), 要麼……要麼……, 要么……要么…… (yàome...yàome...)
 * Czech:
 * Dutch: ofwel...ofwel, hetzij...hetzij
 * Estonian:
 * Faroese: antin ... ella
 * Finnish:
 * French: ,
 * German: ...


 * Hungarian: ......
 * Italian: ,
 * Polish: ... ..., ... ...
 * Portuguese: ...
 * Russian: ..., ...
 * Scots: ither
 * Scottish Gaelic: aon chuid, an dara cuid
 * Spanish:
 * Swedish: antingen...

Usage notes

 * When there are more than two alternatives, "any" is used instead.

Anagrams

 * theire