double

Twice the number, amount, size, etc.

A person who resembles and stands in for another person, often for safety purposes

"Saddam Hussein was rumored to have many doubles."

A drink with two portions of alcohol.

"On second thought, make that a double."

To multiply by two.

"The company doubled their earnings per share over last quarter."

To fold over so as to make two folds.

"To make a pleat, double the material at the waist."

To be the double of; to exceed by twofold; to contain or be worth twice as much as.

Made up of two matching or complementary elements.

"The closet has double doors."

Of twice the quantity.

"Give me a double serving of mashed potatoes."

Of a family relationship, related on both the maternal and paternal sides of a family.

"He's my double cousin as my mother's sister married my father's brother."

Twice over; twofold; doubly.

Two together; two at a time. (especially in see double)

"There are only a few beds, so some of the children will have to sleep double for the night."

The double time, a marching cadence (pace) approaching running speed.