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