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