WordReference Random House Learner's Dictionary of American English © 2017
ei•ther /ˈiðɚ, ˈaɪðɚ/USA pronunciation   adj. [+ singular countable noun]
  1. one or the other of two: You may sit at either end of the table.
  2. each of two;
    the one and the other: There are trees on either side of the river.

pron. 
  1. one or the other: Either will do.

conj. 
  1. (used with or to indicate a series of choices): Either call or write.

adv. 
  1. (used with a negative word, phrase, or clause) as well;
    likewise: If you don't go, I won't either.
    When used as the subject, the pronoun either takes a singular verb even when followed by a prepositional phrase with a plural object: Either of the shrubs grows well in this soil. As an adjective either refers only to two of anything. As a conjunction, either often introduces a series of more than two: pizza topped with either onions, peppers, or mushrooms. Usage guides say that when subjects are joined by eitheror (or neithernor), the verb is singular or plural depending on the noun or pronoun nearer the verb: Either the parents or the school determines the program. Either the school or the parents determine the program. See also neither.

WordReference Random House Unabridged Dictionary of American English © 2017
ei•ther  (ē′ᵺər, ī′ᵺər),USA pronunciation adj. 
  1. one or the other of two:You may sit at either end of the table.
  2. each of two; the one and the other:There are trees on either side of the river.

pron. 
  1. one or the other:There are two roads into the town, and you can take either. Either will do.

conj. 
  1. (a coordinating conjunction that, when preceding a word or statement followed by the disjunctiveor,serves to emphasize the possibility of choice):Either come or write.

adv. 
  1. also;
    too;
    as well;
    to the same degree (used after negative clauses coordinated by and, or, or nor, or after negative subordinate clauses):He's not fond of parties, and I'm not either. If you don't come, she won't come either.
  • bef. 900; Middle English; Old English ǣgther, contraction of ǣghwæther each of two, both; see ay1, whether
&newli;
    When the pronoun either is the subject and comes immediately before the verb, the verb is singular:Either is good enough. Either grows well in this soil.When either is followed by a prepositional phrase with a plural object, there is a tendency to use a plural verb, but a singular verb is more common:Either of them is (or are ) good enough. Either of the shrubs grows (or grow ) well in this soil.As an adjective either refers only to two of anything:either side of the river; using either hand.As a pronoun either sometimes occurs in reference to more than two (either of the three children), but any is more common in this construction (any of the three children). As a conjunction, either often introduces a series of more than two:The houses were finished with either cedar siding or stucco or brick. The pizza is topped with either anchovies, green peppers, or mushrooms.Usage guides say that the verb used with subjects joined by the correlative conjunctions eitheror (or neithernor) is singular or plural depending on the number of the noun or pronoun nearer the verb:Either the parents or the school determines the program. Either the school or the parents determine the program.Practice in this matter varies, however, and often the presence of one plural, no matter what its position, results in a plural verb:Either the parents or the school determine the program. In carefully edited writing, these correlative conjunctions are usually placed so that what follows the first correlative is parallel to what follows the second:The damage was done by either the wind or vandals or either by the wind or by vandals (not done either by the wind or vandals ). See also neither.
&newli;
    The pronunciations (ē′ᵺər)USA pronunciation and (nēᵺər),USA pronunciation with the vowel (ē)USA pronunciation of see, are the usual ones in American English for the words either and neither. The pronunciations (ī′ᵺər)USA pronunciation and (nīᵺər),USA pronunciation with the (ī)USA pronunciation vowel of bite, occur occasionally for these words, chiefly in the speech of the educated and in the network standard English of radio and television. Both the (ē)USA pronunciation and (ī)USA pronunciation pronunciations existed in British English, and in the 19th century the (ī)USA pronunciation came to predominate in standard British speech. In American English, therefore, it reflects a recent borrowing from British speech rather than a survival from the time of early settlement, influenced as well by the ei spelling, which is pronounced as (ī)USA pronunciation in such words as height and stein.


Collins Concise English Dictionary © HarperCollins Publishers::

either /ˈaɪðə; ˈiːðə/ determiner
  1. one or the other (of two): either coat will do
  2. (as pronoun): either is acceptable
  3. both one and the other: there were ladies at either end of the table
  4. (coordinating) used preceding two or more possibilities joined by "or": you may have either cheese or a sweet
adv (sentence modifier)
  1. (used with a negative) used to indicate that the clause immediately preceding is a partial reiteration of a previous clause: John isn't a liar, but he isn't exactly honest either
Etymology: Old English ǣgther, short for ǣghwæther each of two; related to Old Frisian ēider, Old High German ēogihweder; see each, whether
USAGE
Either is followed by a singular verb in good usage: either is good; either of these books is useful. Care should be taken to avoid ambiguity when using either to mean both or each, as in the following sentence: a ship could be moored on either side of the channel. Agreement between the verb and its subject in either…or… constructions follows the pattern given for neither…nor…




'either' also found in these entries:
Collocations: either [side, part, type, class, route, direction], (on) either side of the [road, river, field], there were [people, trees, bars] on either side, more...

Forum discussions with the word(s) "either" in the title:


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