We found one dictionary that defines the word plagally:

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1. plagally: Wiktionary

Definitions from Wiktionary (plagally) ▸ adverb:  (music) In a plagal manner. ▸ Words similar to plagally ▸ Usage examples for plagally ▸ Idioms related to plagally ▸ Wikipedia articles (New!) ▸ Words that often appear near plagally ▸ Rhymes of plagally ▸ Invented words related to plagally