We found one dictionary that defines the word passéism:

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1. passéism: Wiktionary

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