We found one dictionary that defines the word Gaianist:

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1. Gaianist: Wiktionary

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