International Astronomical Union (IAU)
Yekâyeš-e Jahâni-ye Axtaršenâsi
Fr.: Union Astronomique Internationale (UAI)
An astronomical association of astronomers that is the controlling body of world astronomy. It was founded in Brussels in 1919.
General: The act of uniting two or more things.
M.E. from O.Fr. union from L.L. unionem (nominative unio) "oneness, unity," from unus, → one, cognate with Pers. yek, as below.