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