plural of doubleness

plural of Double

A surname.

(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.

A disorder of vision in which a single object is seen as two.

(espionage) A spy who pretends to work for one side, when they are actually working for or passing information to the other.

Incomprehensible language. / A language game akin to pig Latin. / A game of jump rope with two ropes and frequently two jumpers.

A cousin who is related on both sides of a family. A relative with four common grandparents.

Alternative form of double-u / something in the shape of two U's (not of a W)

(computing) The action of pushing the button on a mouse twice in quick succession in order to perform a different task that would be performed from a single-click or triple-click.