A thing that is twice as large as usual or is made up of two similar parts. The recipe calls for a double portion of sugar.
A person who looks exactly like another person. The actor's double performed the dangerous stunts in the movie.
A room in a hotel that is meant for two people. We booked a double for our weekend getaway.
A hit in baseball that allows the batter to reach second base. He hit a double to bring in two runs.
A drink with twice the usual amount of alcohol. She ordered a double whiskey to calm her nerves.
(usually plural) A game of tennis, badminton, or similar sport in which there are two players on each side. They decided to play doubles instead of singles to make the match more fun.