We found one dictionary that defines the word tanistship:

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1. tanistship: Wiktionary

Definitions from Wiktionary (tanistship) ▸ noun:  The role or status a tanist. ▸ Words similar to tanistship ▸ Usage examples for tanistship ▸ Idioms related to tanistship ▸ Wikipedia articles (New!) ▸ Popular adjectives describing tanistship ▸ Words that often appear near tanistship ▸ Rhymes of tanistship ▸ Invented words related to tanistship