Artificial Intelligence is a software component of a computer system that learns.
def. Learning of the computer system is any autonomous change in this system that occurs because of experiences that leads to performance increase.
Autonomous Change is a change that system introduces in itself, not because of the external factor such as recompilation using a compiler with better optimization, hardware changes, etc.
Performance Increase depends on a well-defined Quality Criteria, should & can be measured using the strict & logical means.
Performance Decrease is for example forgetting - data loss; not every change leads to performance increase.
Experience is data acquired from observation or experiementation performed by the AI.
System that learns is also called: a Student.