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