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