/si son", -sohn"/ ; Fr. /see sawn"/ , n. , pl. sissonnes /-sonz", -sohnz"/ ; Fr. /-sawn"/ . Ballet.
a jump in which the dancer lands on one foot, with the other extended to the back, front, or side.
[ 1700-10; named after the Comte de Sissonne, 17th-century French noble, said to have invented it ]