Question: Declaring a constant as 'small'..?

Hey folks I'm doing a series expansion in terms of a small variable called e in my case. In this equation there is also a constant, alpha, that is of the same order as e. What I would like to do is expand this and if I expand it to say, order e, I would like not only e^2 terms to be ignored, but also e*alpha and alpha^2 terms. Is there a way to do this?

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