This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. An advocate of progressivism.

"On his blog (one of several "progressivist" liturgical blogs that have arisen in response to the dominance of Traditionalist and pro-Reform of the Reform blogs), he champions the superiority of the Novus Ordo and takes issue with Fr Nicola Bux or other exponents of the "reform of the reform" (without directly attacking the Pope)."