There's no such thing as "evolutionism". Evoluiton is a grand theory, composed of a mutitude of well supported theories. The "educated guesses" are hypothesis regarding particular details. The standing of the theory of evolution itself, does not depend on any of those particular details. That holds regardless of whether, or not, there's a hypothesis connected to the particular element.
IOWs the theory applies to the set. What's known about any of the details within the set is irrelevant as far as the set's concerned, because the set is open.
Your argument is with the dictionary. Look it up. It exists.
Evolution is a grand theory, composed of a mutitude of well supported theories.
It does not even merit "well-supported theories." Well supported theories are based upon more than educated guesses about history.
The "educated guesses" are hypothesis regarding particular details.
Fine. They should be presented as such, and taught as such in schools.
The standing of the theory of evolution itself, does not depend on any of those particular details.
If evolutionism wants to present itself as "science" in public schools, then it ought have more than a collection of educated guesses in its favor. It does not. The word "theory" is abused when placed along side the word "evolution" when used to support the notion that man is a derivative of an undesigned, unguided combination of matter beginning with the simplest of life forms and progressing to a more elaborate state.