It's nice to know that creationists have control over all the dictionaries out there, including "livescience", wikipedia (well-known for being a bastion of creationism, right?), and biology-online.org.
Well, let's take a look...
Evolution - Biology-Online Dictionary
https://www.biology-online.org/dictionary/Evolution
Sep 30, 2016 - Definition. noun, plural: evolutions. (1)
The change in genetic composition of a population over successive generations,
Sure looks like "change in allele frequency in a population over time, doesn't it? You think it's a coincidence that the most accurate definition is found in a dictionary of biology?
Let's look at the other science site:
Darwin's Theory of Evolution: Definition & Evidence - Live Science
https://www.livescience.com › History
May 13, 2015 -
The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits.
This one is Darwin's theory, formulated before genetics. It's accurate, but leaves out the fact that it's due to changes in alleles (different versions of the same gene). But it does say that it's Darwin's theory, not the modern theory which was changed to include genetics.
The others are variously inaccurate, which is why you have to be very careful about getting definitions of scientific terms from sources that don't have much to do with science.
I especially like the following graph, showing that evolution as a concept was hardly ever mentioned before Darwin published his theory, suggesting, of course, that practically all of the definitions of evolution that we use today are related to Darwin's theory.
Darwin's term was "descent with modification." He used the word "evolution" once that I know about in his book (the last word in the book in one edition). But he used it in the formal sense of "changed."
Far as I know, the ability of populations to change over time was not called "evolution" until later. The notion that organisms could change is pretty old; St. Augustine mentioned it, and by Darwin's time, most people realized that some kind of change must happen. Lamark, for example had a theory before Darwin, which turned out to be wrong in almost all cases. Don't think he called it "evolution" though. Everything I've read from him called it "acquired characteristics."