noun

1. Twice the number, amount, size, etc.

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

   “Saddam Hussein was rumored to have many doubles.”

3. A drink with two portions of alcohol.

   “On second thought, make that a double.”

verb

1. To multiply by two.

   “The company doubled their earnings per share over last quarter.”

2. To fold over so as to make two folds.

   “To make a pleat, double the material at the waist.”

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

Synonyms: redouble, facsimilize

adjective

1. Made up of two matching or complementary elements.

   “The closet has double doors.”

2. Of twice the quantity.

   “Give me a double serving of mashed potatoes.”

3. 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.”

Synonyms: twofold, binary, twin, duplicate, twofold

adverb

1. Twice over; twofold; doubly.

2. 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.”

Synonyms: doubly

noun

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

Synonyms: double