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