Online Google Dictionary

either 中文解釋 wordnet sense Collocation Usage Collins Definition
Conjunction
/ˈēT͟Hər/,/ˈīT͟Hər/,
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Used before the first of two (or occasionally more) alternatives that are being specified (the other being introduced by “or”),
  1. Used before the first of two (or occasionally more) alternatives that are being specified (the other being introduced by “or”)
    • - either I accompany you to your room, or I wait here
    • - available in either black or white
  2. Used to indicate a similarity or link with a statement just made
    • - you don't like him, do you? I don't, either
    • - it won't do any harm, but won't really help, either
  3. For that matter; moreover (used to add information)
    • - I was too tired to go. And I couldn't have paid my way, either
Determiner
  1. One or the other of two people or things
    • - there were no children of either marriage
    • - they have a mortgage that will be repaid if either of them dies
  2. Each of two
    • - the road was straight with fields of grass on either side
  1. 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"
  2. Either/or means "one or the other." 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. ...
  3. as well; Both, each of two (people or things); One or other of two people or things; Introduces the first of two options, the second of which is introduced by "or"; Each of two. [from 9th c.]; One or the other of two. [from 14th c.]
  4. click the relevant Browse option (e.g., Browse origin ») to display the available filters. Choose a filter from the list by clicking on it. A  next to an item indicates that a category can be expanded further. Click  to contract it again.
  5. Either as an adjective meaning "each (of two)" is still in common use ("a path lined with large trees on either side"). In either . . . ...
  6. the arguments, despite their persuasiveness, conceal a fallacy.
  7. we are facing collapse of the very systems that sustain life on the planet, with a terribly small chance of avoiding cataclysm if we manage to fundamentally reshape global society in four years, as climate scientists acting from a precautionary view advise;
  8. or  fallacy  Arguing that a complex situation can be simply explained in one of two ways.    example- “Either we must ban X or the American way of life will collapse.”
  9. ad. one of two, but not the other
  10. independent advisers