How many vowels are in the word hypothesis?

Answer 1

The word "hypothesis" contains three vowels: o, e, and i. Vowels are the letters a, e, i, o, u, and sometimes y. In this case, the letter y in "hypothesis" is not acting as a vowel, so it is not counted.

Answer 2

There are 3 vowels in "hypothesis" (4 if you count the 'y').