The phrase "Evolution is a fact"

I think that facts only true exist by definition or logic.
1 + 1 = 2 is a fact because we have defined it.You can never truly prove that gravity exists. Sure, if you let a apple fall, it'll hit the ground. Maybe just once in a billion years it doesn't. How many times do you repeat an experiment before you accept the result.In the strictest sense, you can only ever disprove a theory. If you could, given the evidence for evolution, we wouldn't have this discussion.

In the 1500 the country decided / accepted that Henry VIII was king of England. Their decision has made it so. Just to make sure that everyone got it, they even put a crown on hit head. Whoever wears it is king. If that is not a definition then I don't know what is.