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