• (n.) A half vault; one of the seven artificial motions of a horse, in which he raises his fore legs in a particular manner.
Dem'i·volt` noun [ Confer French demi- volte .] (Man.) A half vault; one of the seven artificial motions of a horse, in which he raises his fore legs in a particular manner. 
demivolt A half vault (volt); one of the seven artificial motions of a horse, in which he raises his fore legs in a particular manner.
a half turn made by a horse with forelegs raised.