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