Intelligence is the ability of living creatures
to process information
... is ability ...
It is one of those biological traits , that determine effectiveness of a subject in situations, in which the goal of his efforts is clear.
... to process information ...
Information is every change, which a subject discriminates. In the definition a crucial word is to process. Intelligence does not express in processes in which information is only transmitted. It is important that a subject processes information in a way that is new for him.
... living creatures ...
Intelligence is not only man's ability. It is an ability of all living creatures who process information with a central nervous system.