• Webster's Revised Unabridged Dictionary
    • Progressionist One who holds to a belief in the progression of society toward perfection.
    • Progressionist One who maintains the doctrine of progression in organic forms; -- opposed to uniformitarian.
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Century Dictionary and Cyclopedia
    • n progressionist One who believes in or advocates progress in society or politics.
    • n progressionist One who maintains the doctrine that society is in a state of progress toward perfection, and that it will ultimately attain it.
    • n progressionist One who holds that the existing species of animals and plants were not originally created, but were gradually developed from one simple form.
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Chambers's Twentieth Century Dictionary
    • ns Progressionist one who believes in the progress of society and its future perfection: one who believes in the development of animals and plants from one simple form
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Chambers's Twentieth Century Dictionary
Fr.,—L. progressusprogredi, to go forward—pro, forward, gradi, to go.


In literature:

Watch how cleverly he will decoy them into the progressionist camp.
"The Progressionists, and Angela." by Conrad von Bolanden