acceptance for settlement
the stage in the processing of a payment at which it has passed all risk management and other tests and can be settled under the system’s rules and procedures.

acceptor
any trading or service establishment that accepts, on its own behalf or on behalf of its network, the payment of goods or services via an electronic money instrument.

access
the right of or opportunity for an institution to use the services of a particular payment system to settle payments on its own account or for customers. See also direct participant, direct participant/member, indirect participant/member, participant/member.

access products
payment instruments that allow customers to access their deposit accounts and to transfer the deposits therein. Examples include electronic funds transfers at the point of sale and home banking facilities.

accountability
record-keeping of electronic money transactions.

ACH
see automated clearing house.

acquirer
the entity or entities that hold(s) deposit accounts for card acceptors (merchants) and to which the card acceptor transmits the data relating to the transaction. The acquirer is responsible for the collection of transaction information and settlement with the acceptors.

acquiring technical operator
the party providing the technical facilities for each acquiring entity to accept the data relating to each transaction.

advisory netting
see position netting.
agency relationship
a contractual relationship in which one party, the agent, acts on behalf of another party, the principal. The agent may execute trades for the principal but is not responsible for performance by the principal.

agent
an entity, such as a fund manager or a custodian, that undertakes a securities loan and negotiates the terms with the borrower on behalf of a customer-owner.

that was already told that these terms are useful for letter writing .
well it is better to have them more classified and concised!
thank u