noun: (historical) A soldier of the original imperial guard that was created by Napoleon I in 1804 and that made the final French charge at Waterloo.
noun: (games, slang) Someone who enjoys playing older war-games or roleplaying games, or older versions of such games, when newer ones are available.
noun: (Military) A soldier or enthusiast in attention to detail for rules and regulations. Respected as an expert in things most people don’t care about.