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