Lewis Short
(verb) : auctumno (correctly aut-), āre, id.
* To cause or bring on autumn (only in the two foll. exs.): corus autumnat,Plin. 2, 47, 47, § 124: aër aestate nimbosā semper quodam modo vernat vel autumnat,id. 2, 50, 51, § 136.
Charlton T. Lewis, Charles Short, A Latin Dictionary