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