Greek-derived nouns ending in -on change to -a in the plural form.
Fusion is regular. It follows the Greek -a rule.
Use plural verbs: "The fusia are ready" (not "is ready").
Yes. The plural fusia is standard across all English variants.
The word fusion follows the standard English pluralization rule. When forming the plural, fusion becomes fusia. This follows the Greek -a pattern, which is one of the most common plural rules in English.
Understanding why fusion becomes fusia helps with spelling and pronunciation. Greek-derived nouns ending in -on change to -a in the plural form.
When using fusia in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The fusia are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.