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