This word is acceptable for play in the UK dictionary that is being used in the following games:

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n. An advocate of social progress, ideally towards perfection

n. A person who holds that all life forms gradually evolve to a higher form

n. One who holds to a belief in the progression of society toward perfection.

n. One who maintains the doctrine of progression in organic forms; -- opposed to uniformitarian.

n. One who believes in or advocates progress in society or politics.

n. One who maintains the doctrine that society is in a state of progress toward perfection, and that it will ultimately attain it.

n. One who holds that the existing species of animals and plants were not originally created, but were gradually developed from one simple form.

"Even the venerable Rudolph Wagner, whom no man will accuse of progressionist proclivities, has raised his voice on the same side; while not a single anatomist, great or small, has supported Professor Owen."

uniformitarian