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