What the body reports before the mind has an argument. Emotion is information, arriving in a form that cannot be checked.
French émotion, from émouvoir (to stir up), from Latin exmovere/emovere, ex- (out) plus movere (to move); a stirring that moves something within into view.
Its root is a stirring that moves something into view, the same movement behind motive and moving. Emotion is information already in transit before anyone decided to look for it, which is why it cannot be checked the way a still fact can.