a circular tread; a gait by which a horse going sideways round a center makes two concentric tracks.-a sudden movement to avoid a thrust.-the unit of electro-motive force; -- defined by the international electrical congress in 1893 and by united states statute as, that electro-motive force which steadily applied to a conductor whose resistance is one ohm will produce a current of one ampere. it is practically equivalent to / the electro-motive force of a standard clark's cell at a temperature of 15¡ c.