jane

noun4

1. •
   (informal) used as a placeholder name for any woman, especially a young working-class woman
2. •
   (slang) A girlfriend.

   • What happened to your regular Jane?
3. •
   (slang) A female client of a prostitute.

   • The Swedish system, seemingly, does not target “janes” (female clients of sex workers). — 2014
4. •
   (no longer used) A silver Genovese coin, first used in England in the 14th century.

   • 14th c, Geoffrey Chaucer, The Rime of Sire Thopas, The Canterbury Tales, 1793, A Complete Edition of the Poets of Great Britain, Volume 1, page 124, His robe was of chekelatoun, / That coste many a jane.