For units in astronomy, see astronomical system of units. The astronomical unit (symbol au, AU or ua) is a unit of length, roughly the distance from the Earth to the Sun. However, that distance varies as the Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year.
senza. prep. 1. (Classical Music) music without; omitting. [Italian]. 1  Facebook.enza. prep. 1. (Classical Music) music without; omitting. [Italian]. 1  Facebook.
Webster Dictionary(0.00 / 0 votes)Rate this definition: 1  Senna(noun) the leaves of several leguminous plants of the genus Cassia. 2  Senna(noun) the plants themselves, native to the East, but now cultivated largely in the south of Europe and in the West Indies.