A pair of two similar or equal things; couple.
A very small flowering plant, Dimeresia howellii.
Either of two dice, each of which, when thrown, has the same number of spots on the face lying uppermost.
A man’s waistcoat.
A man’s close-fitting jacket, with or without sleeves, worn by European men from the 1400s to the 1600s.
A word (or rather, a halfword) consisting of two bytes.
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).
An imitation gem made of two pieces of glass or crystal with a layer of color between them.
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.
In textual criticism, two different narrative accounts of the same actual event.
A word or phrase set a second time by mistake.
A word ladder puzzle.
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.
Dipole antenna.
An opposite-sex married couple.