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