Noun

1. a man’s close-fitting jacket, with or without sleeves. Men in Europe wore doublets from the 1400s to the 1600s.
2. a pair of two similar or equal things; couple.
3. one of two or more different words in a language derived from the same origin but coming by different routes.
4. An imitation gem made of two pieces of glass or crystal with a layer of color between them.
5. A word or phrase set a second time by mistake.
6. A quantum state of a system with a spin of 1/2, such that there are two allowed values of the spin component, -1/2 and +1/2.
7. A word (or rather, a halfword) consisting of two bytes

Quotations

• 1602 : Hamlet by William Shakespeare, act 2 scene 1 line 75

  Lord Hamlet, with his doublet all unbraced,