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Doublet may refer to:
- Doublet (clothing), a man's snug-fitting buttoned jacket that was worn from the late 14th century to the mid 17th century
- Doublet (lapidary), an assembled gem composed in two sections, such as a garnet overlaying green glass
- Doublet (lens), a type of lens, made up of two stacked layers with different refractive indices
- Doublet (linguistics), one of two or more words of the same language that come from the same root
- Doublet state, a state in quantum physics of a system with a spin of ½
- Doublet (potential flow), fluid flow due to a source–sink combination
- Pierre Jean Louis Ovide Doublet (1749–1824), a politician and writer from France
- Word ladder or "doublets", a word game invented by Lewis Carroll
- In mathematics, the unit doublet is the derivative of the Dirac delta function
- In textual criticism, two different narrative accounts of the same actual event
- Dimeresia howellii, a tiny flowering plant.
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