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