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