Order. 1. In classical architecture, a column with base (usually), shaft, capital, and entablature, decorated and proportioned according to one of the accepted modes -- Doric, Tuscan, Ionic, Corinthian or Composite. The simplest is the Tuscan, supposedly derived from the Etruscan-type temple, but the Doric is probably earlier in origin and is subdivied into Greek Doric and Roman Doric, the former having no base, as in the Parthenon and the temples at Paestrum.
-- John Fleming, Hugh Honour & Nikolaus Pevsner, 1991
The Penguin Dictionary of Architecture
Penguin Books, London, England