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