Definition from macmillandictionary.com
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Cheque or credit card – you can use either.
Applications are welcomed from people of either sex and any age.
It was a long time before either of them spoke.
Jackie could play the piano and sing, whereas I couldn’t do either.
Most of the troublemakers were not supporters of either team.
I didn’t like either of the candidates.
We tried another method, but that didn’t work either.
It’s a problem I can’t solve, and I don’t think anyone else can either.
He did a superb job, and he didn’t have any help either.