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