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1. Twice as much in size, strength, number, or amount: a double dose.
2. Composed of two like parts: double doors.
3. Composed of two unlike parts; dual: a double meaning; a double role for an actor.
4. Accommodating or designed for two: a double bed; a double room.
5. Characterized by duplicity; deceitful: speak with a double tongue.
6. Botany Having many more than the usual number of petals, usually in a crowded or an overlapping arrangement: a double chrysanthemum.
1. Something increased twofold.
2. One that closely resembles another; a duplicate.
a. Something having two identifiable or prominent parts or members.
b. Something capable of carrying, moving, or holding two people or things, as a mattress.
a. An actor's understudy.
b. An actor who takes the place of another actor in scenes requiring special skills or preparations: a stunt double; a body double.
5. An apparition; a wraith.
a. A sharp turn in a direction of movement; a reversal.
b. A sharp, often devious change in position or argument; a shift.
7. doubles Sports A form of a game, such as tennis or handball, having two players on each side.
8. Baseball A hit enabling the batter to reach second base. Also called two-bagger, two-base hit.
9. Games
a. A bid in bridge indicating strength to one's partner; a request for a bid.
b. A bid doubling one's opponent's bid in bridge, thus increasing the penalty for failure to fulfill the contract.
c. A hand justifying such a bid.
v. dou·bled, dou·bling, dou·bles
1. To make twice as great.
2. To be twice as much as: doubled the score of his opponent.
3. To fold in two.
4. To clench (one's fist).
5. To duplicate; repeat.
6. To turn (an enemy spy) into a double agent.
7. Baseball
a. To cause the scoring of (a run) by hitting a double.
b. To advance or score (a runner) by hitting a double.
c. To put out (a runner) as the second part of a double play.
8. Games To challenge (an opponent's bid) with a double in bridge.
9. Music To duplicate (another part or voice) an octave higher or lower or in unison.
10. Nautical To sail around: double a cape.
1. To be increased twofold: The debt soon doubled.
2. To turn sharply or all the way around; reverse one's course: had to double back to touch the missed base.
3. To serve in an additional capacity: a frying pan that doubles as a pie tin; a conductor who doubles as a pianist.
4. To replace an actor in the actor's absence or in a certain scene.
5. Baseball To hit a double.
6. Games To announce a double in bridge.
1. To twice the amount or extent; doubly: paid double for the customized car.
2. Two together; in pairs: sleeping double.
3. In two: bent double.
Phrasal Verb:
double up
1. To bend suddenly, as in pain or laughter.
2. To share accommodations meant for one person.
on/at the double
1. Immediately.
2. In double time.

[Middle English, from Old French, from Latin duplus; see dwo- in Indo-European roots.]

dou′ble·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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I only know myself as a human entity; the scene, so to speak, of thoughts and affections; and am sensible of a certain doubleness by which I can stand as remote from myself as from another.
The voice that said this made sweet music to Maggie; but athwart it there came an urgent, monotonous warning from another voice which she had been learning to obey,--the warning that such interviews implied secrecy; implied doing something she would dread to be discovered in, something that, if discovered, must cause anger and pain; and that the admission of anything so near doubleness would act as a spiritual blight.
Casaubon suspect Dorothea of any doubleness: he had no suspicions of her, but he had (what was little less uncomfortable) the positive knowledge that her tendency to form opinions about her husband's conduct was accompanied with a disposition to regard Will Ladislaw favorably and be influenced by what he said.
When compared with the academic plays she discusses in this chapter, Ignoramus and Senile Odium, the professional plays reframe this lingering negativity as somewhat more nuanced--the academic plays use twin characters as 'an image of doubleness' that obscures identity for comedic purposes, making 'imitatio, not twinship, the main focus of these academic dramas' (137).
There's a wonderful doubleness to the setup, crazy would-be Nazis on one side, dogged English eccentrics on the other.
Writing of "the Internet as the engine of existential doubleness," she concludes: "Our era is rich with identification-via-hashtag ...
Mandanipour, living in literary exile in the United States since 2006, seems to thrive on the idea of doubleness. Perhaps it is fueled by the predicament of a writer who has lived through one set of national contexts and stories and finds his oxygen for writing about those events outside his country in the strangeness of exile.
It involved the subtle but unmistakable doubleness in the way Koether "worked" the ritual of the studio visit, just as she had the art-world network in luring me there.
Jaillant shows how Woolf's introduction to Sterne's Sentimental Journey in 1928 conferred a doubleness of prestige: "The 'consecration' process worked in two ways: writers of introductions brought new prestige to old books (and to the World's Classics series), and in turn, these classics increased the cultural aura of already-distinguished authors" (26).
Metaphors of doubleness and double consciousness are not new to postcolonial studies, especially at a historical juncture when diasporic rather than national consciousness has been increasingly defining the field.
Defoe draws attention to doubleness, disintegration, and performativity.
But doubleness of being struck me with ominous force one day in 1988 as I walked out of the US National Archives with photocopies of documents in my briefcase proving that one of the heroes of the allied victory in 1945, General Eisenhower, was a mass murderer and a war criminal.