What Is The Definition Of AAA With Regards To Internet E-commerce?

The term AAA stands for Authentication, Authorization and Accounting when you are using the term in the area of internet and e-commerce. These three are considered as the primary services that are required by the NAS server or protocol. These three services are considered as logically independent and can be implemented separately also. They can be used independently by using the output of the one as the input of the next.
      
Other than this definition of AAA, there are some other definitions also that can be taken as the definition of the term but they convey something completely different and have no relevance with internet. You can use the term as the abbreviated form of 'Architecture and Allied Arts' and sometimes it is also being used to convey the idea of 'Anti Aircraft Artillery'.