Apparently soAccording to the fountain of knowledge that is wikipedia, there were 26 'seasons' of the old Doctor Who, and then they were called 'series' in the new, um, series.
(,
Thu 5 Mar 2009, 17:10,
archived)
It should always be "series""Season" is some god-awful merkin import.
(
Barbarossa is not my real name,
Thu 5 Mar 2009, 17:13,
archived)