Sorry evolution is defined as ongoing change and it is a fact that applies to more than evolution. The theory of evolution observes the fact, evidence and empirical evidence for the fact and provides a explanation for the fact.
In the life sciences, evolution is a change in the traits of living organisms over generations, including the emergence of new species. In other fields evolution is used more generally to refer to any process of change over time. Web definition
The the theory of evolution presents evidence and empirical evidence that the fact (evolution or ongoing change) explains the origin of the species. Evolution is both a fact and a theory.
You are using a tautology to 'splain a tautology. Does not compute.