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