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A
Acceptor
Access point
Access right
Accounting Centre
Accounting transaction
Acknowledgement
Algorithm
Approval
Archiving
Assessment
Evaluation

Asymmetric algorithm
ATM card
ATM withdrawal
Attack
Audit trail
Authentication
Authorisation
Authorisation request
Automated clearing house (ACH)
Automated teller machine (ATM)
Availability
Approval

First meaning :
Recognition by an authority that a device or system meets the needs expressed by a community represented by this authority.

Second meaning :
Authorization to use a product or a system for a specific purpose or in accordance with previously arranged conditions. Granted by the authority responsible for its implementation, which may require a prior evaluation before making its decision.