We found one dictionary that defines the word confirmationist:

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1. confirmationist: Wiktionary

Definitions from Wiktionary (confirmationist) ▸ noun:  A proponent of confirmationism. ▸ Words similar to confirmationist ▸ Usage examples for confirmationist ▸ Idioms related to confirmationist ▸ Wikipedia articles (New!) ▸ Popular adjectives describing confirmationist ▸ Words that often appear near confirmationist ▸ Rhymes of confirmationist ▸ Invented words related to confirmationist