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