double

double

1. (of flowers) having more than the normal number of petals

2. Maths

a. (of a root) being one of two equal roots of a polynomial equation

b. (of an integral) having an integrand containing two independent variables requiring two integrations, in each of which one variable is kept constant

3. Music

a. (of an instrument) sounding an octave lower than the pitch indicated by the notation

b. (of time) duple, usually accompanied by the direction alla breve

4. an actor who plays two parts in one play

5. Bridge a call that increases certain scoring points if the last preceding bid becomes the contract

6. Billiards Snooker a strike in which the object ball is struck so as to make it rebound against the cushion to an opposite pocket

7. a bet on two horses in different races in which any winnings from the horse in the first race are placed on the horse in the later race

8. Chiefly RC Church one of the higher-ranking feasts on which the antiphons are recited both before and after the psalms

9. Music an ornamented variation in 16th and 17th century music

10. 

a. the narrow outermost ring on a dartboard

b. a hit on this ring