I was checking out the definition of either in dictionary, here is what I found:
one or the other of two things (any of the things will be fine)
one and the other of two things (either side of the road)
so, the word "either" can basically mean both any or both, is that right?
Let's say I want to say:
Either of these options will do (any of the two options will do)
Can it also mean both of the options will do?
Best Answer
Yes, that’s right. In general, it turns out that sometimes either is distributive, essentially meaning both or all, and sometimes it is exclusionary and so applies to just one out of the set.
Your question is whether it would be understood to mean just one or if it would mean two in the sentence:
The answer is that here it means that just one option suffices. It means “any single option”. If you have any doubts about how it will be received, you can always write any one option or some such.
For the most part, I think the “each one” or “both” sense applies to natural pairs. Here are some OED citations for the “both” kind of either:
Note that either meaning “both” is the oldest of the various senses the word has come to mean historically. It is somewhat uncommon these days, but by no means wholly obsolete.