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.
Definitions for SENA. Here are all the possible meanings and translations of the word SENA. Freebase(0.00 / 0 votes)Rate this definition: The simple station SENA is part of the TransMilenio mass-transit system of BogotÃ¡, Colombia, opened in the year 2000.