# Interaction picture counter rotating terms

In the interaction picture, we often do the rotating wave approximation where terms like $$e^{i(\omega_1 + \omega_2)t}$$ are ignored because they represent rapidly oscillating terms which ends up canceling each other out on average. In the literature this term is often called a "counter-rotating term". I know that the interaction picture is equivalent to a rotating frame but not sure how this term $$e^{i(\omega_1 + \omega_2)t}$$ represents counter-rotation. So, my question is why do we use this specific phrase?