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