| Word | Description |
| ActiveX | This set of technologies from Microsoft provides tools for linking desktop applications to the World Wide Web. Using a variety of programming tools -including Java, Visual Basic, and C++ - developers can create interactive web content. For instance, ActiveX technology allows users to view Word and Excel documents directly in a browser. |
| ACXSYS | Acxsys Corporation is a Canadian company based in Toronto, involved in banking. Businesses include the operation of the Interac Email Money Transfer service, the Interac Online service, and Cross Border Debit. |
| Agile Software Development | Agile software development refers to a group of software development methodologies that promotes development iterations, open collaboration, and process adaptability throughout the life-cycle of the project. |
| Authorization | The process by which the credit card company and/or bank permits the payment transaction to proceed. See also Pre-authorization. |