The Collaborative International Dictionary of English v.0.48:

Volt \Volt\, n. [F. volte; cf. It. volta. See Vault.]
   [1913 Webster]
   1. (Man.) A circular tread; a gait by which a horse going
      sideways round a center makes two concentric tracks.
      [1913 Webster]

   2. (Fencing) A sudden movement to avoid a thrust.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Volt \Volt\, n. [After Alessandro Volta, the Italian
   electrician.] (Elec.)
   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 amp[`e]re. It is practically
   equivalent to 1000/1434 the electro-motive force of a
   standard Clark's cell at a temperature of 15[deg] C.
   [1913 Webster]

WordNet (r) 3.0 (2006):

volt
    n 1: a unit of potential equal to the potential difference
         between two points on a conductor carrying a current of 1
         ampere when the power dissipated between the two points is
         1 watt; equivalent to the potential difference across a
         resistance of 1 ohm when 1 ampere of current flows through
         it [syn: volt, V]