either
adv. sent.adv. used to say that a negative statement is also true for someone or something else. You use it at the end of a sentence to mean 'also' or 'too' when you are saying 'no'.
adv. used to indicate a similarity or link between two negative statements. Functions as a negative additive focus particle, typically appearing in clause-final position.
I don't like coffee, and I don't like tea either.
If you aren't going to the party tonight, then I'm not going either.
The first experiment failed to produce significant results, and the subsequent trials did not yield any usable data either, leading the team to reconsider their hypothesis.
From Middle English either, from Old English ǣġhwæþer, from Proto-West Germanic aiw + gahwaþar. Akin to Old Saxon eogihwethar, iahwethar (Low German jeed); Old Dutch iogewether, iowether, *iother (Dutch ieder); Old High German eogihwedar, iegihweder, ieweder (German jeder).
Used at the end of a negative clause to add another negative point. It corresponds to 'too' or 'also' in affirmative sentences.
I don't like it too.I don't like it either.In negative sentences, use 'either' instead of 'too' or 'also' to show agreement.