Nouns ending in -s, -x, -z, -ch, or -sh add -es to form the plural. This makes the word easier to pronounce.
Hypothesis is regular. It follows the -es Addition rule.
Use plural verbs: "The hypothesises are ready" (not "is ready").
Yes. The plural hypothesises is standard across all English variants.
The word hypothesis follows the standard English pluralization rule. When forming the plural, hypothesis becomes hypothesises. This follows the -es Addition pattern, which is one of the most common plural rules in English.
Understanding why hypothesis becomes hypothesises helps with spelling and pronunciation. Nouns ending in -s, -x, -z, -ch, or -sh add -es to form the plural. This makes the word easier to pronounce.
When using hypothesises in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The hypothesises are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.