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