We found one dictionary that defines the word self-duality:

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1. self-duality: Wiktionary

Definitions from Wiktionary (self-duality) ▸ noun:  The quality of being self-dual. ▸ Words similar to self-duality ▸ Usage examples for self-duality ▸ Idioms related to self-duality ▸ Wikipedia articles (New!) ▸ Popular adjectives describing self-duality ▸ Words that often appear near self-duality ▸ Rhymes of self-duality ▸ Invented words related to self-duality