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