adjective

1. of an empire
2. of a country having control or sovereignty over other countries or colonies
3. of, or having the rank of, an emperor or empress
4. having supreme authority; sovereign
5. 1. majestic; august
   2. imperious
6. of great size or superior quality
7. 1. of or pertaining to the Commonwealth
   2. according to the standard of weights and measures set by British law and used in Great Britain, Canada, and some other countries

Etymology: OFr < L imperialis < imperium, empire

noun

1. a supporter or a soldier of any of the Holy Roman emperors
2. the roof or top of a coach, or a luggage case carried on it
3. an article of great size or superior quality
4. a size of writing paper measuring 23 by 31 inches (in England, 22 by 30 or 32 inches)
5. ☆

   Etymology: after the emperor Louis Napoleon, who set this fashion

   a pointed tuft of beard on the lower lip and chin