noun

1. a man's closefitting jacket with or without sleeves, worn chiefly from the 14th to the 16th cent.
2. either of a pair of similar things
3. a pair; couple
4. a pair of thrown dice with identical sides uppermost
5. a simulated gem produced by cementing together two smaller stones, crystals, or pieces of colored glass
6. Linguis. either of two words that derive ultimately from the same source but by different processes (Ex.: regal, royal; skirt, shirt)
7. Radio dipole ()

Etymology: ME < OFr, dim. of double, orig., something folded, a kind of material: see double