doublet: Meaning and Definition of

dou•blet

1. a close-fitting outer garment, with or without sleeves and sometimes having a short skirt, worn by men in the Renaissance.
2. an undergarment, quilted and reinforced with mail, worn beneath armor.
3. a pair of like things; couple.
4. one of a pair of like things; duplicate.
5. one of two or more words in a language that are derived from the same source, esp. when one is learned while the other is popular, as coy and quiet, both taken from the same Latin word, quiet directly, and coy by way of Old French.
6. an unintentional repetition in printed matter or proof.
7. a throw of a pair of dice in which the same number of spots turns up on each die.
8. a counterfeit gem made of two pieces, either of smaller gemstones, inferior stones, or glass. Cf. imitation doublet, triplet (def. 6).
9. a compound lens made of two thin lenses shaped so as to reduce chromatic and spherical aberrations.