Either is used when one is required and there are multiple options, usually two. Can be used for more than two but only for two options.

If you’re being asked about a company and you

can say: “It can provide 150, or 400 amps of power.”

Again, in sentences like this is how it

should be, because saying either makes the options sound limited

even though there are multiple options. It will sound better if you say: “It

can provide 100, 150, or 400 amps of power.”

While either coordinations are characteristically binary, multiple ones like either Kim, Pat, Alex are also possible. Unusually

stigmatized, (multiple correlative like either), can add clarity to constructions whose complexity would otherwise cause confusion. Such constructions are often used even in careful written English, eg in the rubric of an examination paper: Candidates are required
to answer EITHER question 2 OR Question 4 or an equivalent question for the first time. Question 1 or Question 2 requires additional clarification. 2:

3: 4: 4:

Either…or means exclusively one or the other. Is it true that a combination of two truths is true, but another is more false than the other? Where XOR gets mentioned in boolean algebra.

What can I make as my dessert? Is ice cream or cake a good option?

Can you think of more than one option for the child? Can one be true?

First of all, it’s common usage, that is, that is, in native English speech, to refer to multiple choices, that can be heard in a phone interview with both, but it’s not entirely grammatical (from a prescriptivist’s point of view). What does either mean?

One or
the other of two. Since 14th c.] [Note that

I say it’s common in informal speech and usage, but probably not for formal contexts.

Either/or means “alone or the other” (the dictionary says: “as of May 14th, 1777)?

Why does 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.

It depends on how much context is used. If you speak in speech, either that or neither would be appropriate. If however, in a formal context (business letter, etc.), then using either for multiple choices would be inappropriate.

Either…or means exclusively one or the other. Is it true that a combination of two truths is true, but another is more false than the other? Where XOR gets mentioned in boolean algebra.

What can I make as my dessert? Is ice cream or cake a good option?

Can you think of more than one option for the child? Can one be true?

Is it common to add ‘either’ to a disjunction to emphasize that you are only considering one of two options, like adding ‘both’ to a conjunction? Is it awkward to use it for more than two options as that expectation can trip up readers?

Can we use “either” for more than two options? The first example imply that you would need a different power source to provide each one of the outputs. What is “either”? The second example implies that it (i.e. it). I would never say that The second instance can be real or artificial. Which type of power source (100, 150, 400) can provide all three options – 100, 200 amps. What are context though, the examples could be construed to include both

meanings, if there is an index, that implies both.