What part of speech is between in?

"Between" can be a few different parts of speech, depending on its use in a sentence:

* Preposition: This is the most common use. It shows the relationship between two things, like "the book is between the table and the chair."

* Adverb: This is less common, but it can be used to indicate a position in the middle, like "He stood between the two groups."

* Conjunction: This is also less common, but it can connect two things that are in a middle position, like "The dog ran between the two trees and the fence."

So, the part of speech of "between" depends on the context of the sentence.