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either

2 determiner, pronoun
     
either2 S1 W1
1 one or the other of two things or people [↪ any]:
There's tea or coffee - you can have either.
We can offer a comfortable home to a young person of either sex.
either of
Could either of you lend me five pounds?
2 used to show that a negative statement is true about both of two things or people [↪ neither]:
I've lived in New York and Chicago, but don't like either city very much.
either of
There were two witnesses but I wouldn't trust either of them.
3

either side/end/hand etc

both sides, ends, hands etc [= each]:
He sat in the back of the car with a policeman on either side.
There are shops at either end of the street.
4

either way

a) used to say that something will be the same whichever of two things happens or is true:
You can get to Edinburgh by train or plane, but either way it's very expensive.
b) more or less than a certain amount or measurement:
A few marks either way can make the difference between a pass and a fail.
c) used to say that someone or something does not firmly support or want either one of two things:
'All right, let's do that,' said Camille, who didn't care either way.
5

could go either way

if a situation could go either way, both possible results are equally likely:
The latest opinion poll suggests the vote could go either way.

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