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