# Terminology: Expected Value, Expectation, Expectation Value

According to [Wikipedia::Expected Value] expected value and expectation are correct terms for the first moment of a random variable.

What about expectation value? I have heard and read this term quite often as well.

Which one should I prefer, and which terms are valid in your view?

I think expected value and expectation are the most common in use in the US, I haven't really seen expectation value that much.