(1):

(n.) 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.

(2):

(n.) A sudden movement to avoid a thrust.

(3):

(n.) A circular tread; a gait by which a horse going sideways round a center makes two concentric tracks.