We found one dictionary that defines the word stagnational:

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1. stagnational: Wiktionary

Definitions from Wiktionary (stagnational) ▸ adjective:  Of or relating to stagnation. ▸ Words similar to stagnational ▸ Usage examples for stagnational ▸ Idioms related to stagnational ▸ Wikipedia articles (New!) ▸ Popular nouns described by stagnational ▸ Words that often appear near stagnational ▸ Rhymes of stagnational ▸ Invented words related to stagnational