Английский Этимологический словарь - exorbitant

- 1437, from L. exorbitantem (nom. exorbitans), prp. of exorbitare "deviate, go out of the track," from ex- "out of" + orbita "wheel track." Originally "eccentric;" sense of "excessive, immoderate" first recorded 1440, from notion of "forsaking the right path."