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