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