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