imperial vs mil

imperial

noun
  • A writing paper size measuring 30 × 22 inches, or printing paper measuring 32 × 22 inches. 

  • Any of several combinations of cards which score in this game. 

  • A crown imperial. 

  • A bottle of wine (usually Bordeaux) containing 6 liters of fluid, eight times the volume of a standard bottle. 

  • An outside seat on a diligence or carriage. 

  • A kind of dome, as in Moorish buildings. 

  • A variety of green tea. 

  • A card game differing from piquet in some minor details, and in having a trump. 

  • A tuft of hair on the lower lip (so called from its use by Napoleon III). 

adj
  • Related to an empire, emperor, or empress. 

  • Very grand or fine. 

  • Relating to the British imperial system of measurement. 

  • Of special, superior, or unusual size or excellence. 

mil

noun
  • A unit of measurement equal to ¹⁄₁₀₀₀ of an inch (25.4 µm), usually used for thin objects, such as sheets of plastic. 

  • An angular mil, a unit of angular measurement equal to ¹⁄₆₄₀₀ of a complete circle. At 1000 metres one mil subtends about one metre (0.98 m). Also ¹⁄₆₀₀₀ and ¹⁄₆₃₀₀ are used in other countries. 

  • a former subdivision (¹⁄₁₀₀₀) of the Maltese lira 

How often have the words imperial and mil occurred in a corpus of books? (source: Google Ngram Viewer )