The definition is right. Speciation means "the formation of new and distinct species" or, "the formation of new
species as a result of geographic, physiological, anatomical, or behavioral factors that prevent previously interbreeding populations from breeding with each other."
That is how it is used by people who do science for a living. You clearly are not one of them.
It's not dishonest at all. Scientists all recognize and use the terms. (You or anyone else can easily find the definition used, if you care to look for it.) Just like all lawyers use specific terms that are understood by those in the field. All brain surgeons use specific terms which are recognized by those trained in their fields. Etc. There's nothing dishonest about it.
Scientific theories are never proven. Germ theory will never be proven. The theory of plate tectonics will never be proven. They will not graduate or change into laws or anything else. Ever. They will remain scientific theories so long as they are supported by the evidence. The theory of evolution is supported by mountains of evidence, hence the reason it's a scientific theory. In fact, it's the only valid and usable scientific theory going that adequately explains the diversity of life on earth.
This is an argument from incredulity. Nothing more.
The DNA evidence is more than enough on it's own to confirm the theory of evolution. Never mind all the evidence gleaned from practically every other field of science.
It would be great if anyone even bothered to try to provide evidence for creationism.