of or befitting an empire, emperor, or empress
of the former British Empire
sovereign; royal
regal, imperious, or majestic
belonging to an official nonmetric British series of weights and measures such as the pound and the pint
said of a product: of a superior size or quality
imperially adv
imperialness noun
[Middle English via French from late Latin imperialis, from Latin imperium command, empire, from imperare: see imperative1]