Of or relating to an empire. Of, relating to, or denoting the system of nonmetric weights and measures (the ounce, pound, stone, inch, foot, yard, mile, acre, pint, gallon, etc.) formerly used for all measures in the UK, and still used for some. (of a size of paper) measuring roughly 762 × 559 mm (30 × 22 inches). A small pointed beard growing below the lower lip (associated with Napoleon III of France).