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