The financial definition for Joint clearing members:
Firms that clear on more than one exchange.
Automated Clearing House (ACH)
Automated Clearing House (ACH) A collection of 32 regional electronic interbank networks used to process transactions electronically with a guaranteed one-day bank collection float.
Check clearing The movement of a check from the depository institution at which it was deposited back to the institution on which it was written; the movement of funds in the opposite direction and the corresponding credit and debit to the involved accounts. The Federal Reserve operates a nationwide check-clearing system.
Clearing corporations Organizations that are affiliated with exchanges and are used to complete securities transactions by taking care of validation, delivery, and settlement.