Definitions from Wiktionary ( )

▸ adjective:  Made up of two matching or complementary elements.
▸ adjective:  Of twice the quantity.
▸ adjective:  Of a family relationship, related on both the maternal and paternal sides of a family.
▸ adjective:  Designed for two (people, cars, etc.).
▸ adjective:  Folded in two; composed of two layers.
▸ adjective:  Stooping; bent over.
▸ adjective:  Having two aspects; ambiguous.
▸ adjective:  False, deceitful, or hypocritical.
▸ adjective:  Of flowers, having more than the normal number of petals.
▸ adjective:  (music) Of an instrument, sounding an octave lower.
▸ adjective:  (music) Of time, twice as fast.
▸ adverb:  Twice over; twofold; doubly.
▸ adverb:  Two together; two at a time.
▸ adverb:  Into two halves or sections.
▸ noun:  Twice the number, amount, size, etc.
▸ noun:  A person who resembles and stands in for another person, often for safety purposes
▸ noun:  A drink with two portions of alcohol.
▸ noun:  A ghostly apparition of a living person; a doppelgänger.
▸ noun:  A sharp turn, especially a return on one's own tracks.
▸ noun:  A redundant item for which an identical item already exists.
▸ noun:  (baseball) A two-base hit.
▸ noun:  (bridge) A call that increases certain scoring points if the last preceding bid becomes the contract.
▸ noun:  (billiards, snooker) A strike in which the object ball is struck so as to make it rebound against the cushion to an opposite pocket.
▸ noun:  A bet on two horses in different races in which any winnings from the first race are placed on the horse in the later race.
▸ noun:  (darts) The narrow outermost ring on a dartboard.
▸ noun:  (darts) A hit on this ring.
▸ noun:  (dominoes) A tile that has the same value (i.e., the same number of pips) on both sides.
▸ noun:  (programming) A double-precision floating-point number.
▸ noun:  (soccer) Two competitions, usually one league and one cup, won by the same team in a single season.
▸ noun:  (rowing) A boat for two scullers.
▸ noun:  (sports) The feat of scoring twice in one game.
▸ noun:  (sports, chiefly swimming and track) The feat of winning two events in a single meet or competition.
▸ noun:  (cricket) The achievement of 1000 runs and 100 wickets taken in a single season.
▸ noun:  (historical) A former French coin worth one-sixth of a sou.
▸ noun:  (historical, Guernsey) A copper coin worth one-eighth of a penny.
▸ noun:  (music) Playing the same part on two instruments, alternately.
▸ noun:  (Christianity) A double feast.
▸ noun:  Synonym of double-quick (“fast marching pace”)
▸ noun:  (music) A secondary instrument with which a musician is skilled.
▸ verb:  (transitive) To multiply by two.
▸ verb:  (intransitive) To increase by 100%, to become twice as large in size.
▸ verb:  To be the double of; to exceed by twofold; to contain or be worth twice as much as.
▸ verb:  (transitive) To fold over so as to make two folds.
▸ verb:  (transitive, sometimes followed by up) To clench (a fist).
▸ verb:  (baseball) To get a two-base hit.
▸ verb:  (transitive, often followed by together or up) To join or couple.
▸ verb:  (transitive) To repeat exactly; copy.
▸ verb:  (intransitive) To serve a second role or have a second purpose. [with as]
▸ verb:  (transitive, intransitive, sometimes with "for") To act as substitute for (another theatrical performer in a certain role, etc).
▸ verb:  (theater) To play (both one part and another, in the same play, etc).
▸ verb:  (intransitive) To turn sharply, following a winding course.
▸ verb:  (nautical) To sail around (a headland or other point).
▸ verb:  (music) To duplicate (a part) either in unison or at the octave above or below it.
▸ verb:  (music, intransitive, usually followed by "on") To be capable of performing (upon an additional instrument).
▸ verb:  (bridge) To make a call that will double certain scoring points if the preceding bid becomes the contract.
▸ verb:  (card games, intransitive) To double down.
▸ verb:  (billiards, snooker, pool) To cause (a ball) to rebound from a cushion before entering the pocket.
▸ verb:  (intransitive) To go or march at twice the normal speed.
▸ verb:  (transitive) To multiply the strength or effect of by two.
▸ verb:  (military) To unite, as ranks or files, so as to form one from each two.
▸ verb:  (radio, informal, of a station) To transmit simultaneously on the same channel as another station, either unintentionally or deliberately, causing interference.
▸ verb:  (espionage, intransitive) To operate as a double agent.
▸ noun:  A surname.
▸ noun:  (US, motor racing) Collectively, both the Indianapolis 500, a day race, and the Coca-Cola 600, an evening race, both of which are run on Memorial Day weekend Sunday. Used concerning racers who (wish[/ed/ing] to) participat[e/ed/ing] in both events, typically using a private jet to travel between Indianapolis, Indiana, after the 500 and Charlotte, North Carolina, to get to the 600.

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