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Definition of either adverb from the Oxford Advanced Learner's Dictionary

either

adverb
 
/ˈaɪðə(r)/,
 
/ˈiːðə(r)/
 
/ˈiːðər/,
 
/ˈaɪðər/
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  1. used after negative phrases to state that a feeling or situation is similar to one already mentioned
    • Pete can't go and I can't either.
    • (especially North American English, informal) ‘I don't like it.’ ‘Me either.’ (= Neither do I).
  2. either… or…
    used to show a choice of two things
    • Well, I think she's either Czech or Slovak.
    • I'm going to buy either the blue one or the red one—I can't decide.
    • Either he could not come or he did not want to.
    Topics Preferences and decisionsa2
  3. used to add extra information to a statement
    • I know a good Italian restaurant. It's not far from here, either.
  4. compare or
    Word OriginOld English ǣgther, contracted form of ǣg(e)hwæther, of Germanic origin; ultimately related to aye and whether.
Grammar Point neither / eitherneither / either
  • After neither and either you use a singular verb:
    • Neither candidate was selected for the job.
  • Neither of and either of are followed by a plural noun or pronoun and a singular or plural verb. A plural verb is more informal:
    • Neither of my parents speaks/​speak a foreign language.
  • When neither… nor… or either… or… are used with two singular nouns, the verb can be singular or plural. A plural verb is more informal.
See either in the Oxford Advanced American DictionarySee either in the Oxford Learner's Dictionary of Academic English
halfway
adverb
 
 
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