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