Word Origin & History
mid-15c., from L. exorbitantem (nom. exorbitans), prp. of exorbitare "deviate, go out of the track," from ex- "out of" + orbita "wheel track." Originally "deviating from rule or principle, eccentric;" sense of "excessive, immoderate" (of prices, rates, etc.) first recorded 1660s. Related: Exorbitantly.