from The Century Dictionary.
- noun A day set apart once in each half month for the adjustment of differences between brokers on the English stock exchange. A similar practice prevails in the Continental bourses.
Sorry, no etymologies found.
All this (for be sure no falsehood perishes, but is as seed sown out to grow) has been storing itself for thousands of years; and now the account-day has come.
The French Revolution Thomas Carlyle 1838