definition
A pair of two similar or equal things; couple.
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One of two or more different words in a language derived from the same etymological root but having different phonological forms (e.g., toucher and toquer in French or shade and shadow in English).
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In textual criticism, two different narrative accounts of the same actual event.
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(lapidary) An imitation gem made of two pieces of glass or crystal with a layer of color between them.
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A word or phrase set a second time by mistake.
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A quantum state of a system with a spin of ½, such that there are two allowed values of the spin component, −½ and +½.
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A word (or rather, a halfword) consisting of two bytes.
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A very small flowering plant, Dimeresia howellii.
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A word ladder puzzle.
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An arrangement of two lenses for a microscope, designed to correct spherical aberration and chromatic dispersion, thus rendering the image of an object more clear and distinct.
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Either of two dice, each of which, when thrown, has the same number of spots on the face lying uppermost.
example
to throw doublets
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A game somewhat like backgammon.
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Dipole antenna.