Does neither mean "two"? Neither is most often an adjective meaning "not one or the other of two people or things."

Is neither only used for two?

Neither is used to mean none of two or more. Although some suggest that using the word neither with more than two items is incorrect, it has been commonly used to refer to more than two subjects since the 17th century.

Does neither means both?

It means not either. This might sound a touch complicated, but just remember that neither is often defined as none of. The dictionary definition is not one and not the other of two things. For example, “Neither one of the children were well behaved.” Meaning none of the two children were well behaved.