either

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Concise Oxford English Dictionary © 2008 Oxford University Press:
either /ˈʌɪðə, ˈiː-/
conjunction & adverb
  • 1 used before the first of two (or occasionally more) alternatives specified (the other being introduced by ‘or’).
  • 2 [adv., with neg.] used to indicate a similarity or link with a statement just made.

    ■ moreover.

determiner & pronoun one or the other of two people or things.

■ each of two.

– origin OE ǣgther, contracted form of ǣg(e)hwæther, of Gmc origin; ult. rel. to aye2 and whether.
usage: In good English, it is important that either and or are correctly placed so that the structures following each word balance and mirror each other. Thus, sentences such as either I accompany you or I wait here and I'm going to buy either a new camera or a new video are correct, whereas sentences such as either I accompany you or John and I'm either going to buy a new camera or a video are not well balanced.
'either' also found in these Oxford entries:

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