millesimally

adv

1. (not-comparable)In thousandths.

   “The “tolerance” or “remedy” of fineness, millesimally expressed, is, for gold coins, 0.002; […]”

   “We propose to inquire how far these objects are likely to be gained by the plan recommended by the Parliamentary Committee, having as its basis the pound sterling, millesimally divided, as the integer of the decimal.”