The correct spelling of the word is Repetition. It comes from the verb "repeat," but notice that the 'a' in repeat changes to 'e' in the noun form.

১. "Repeatition" and "Repeatation" are common spelling mistakes because people try to follow the spelling of the base word "repeat".
২. The syllables are divided as re-pe-ti-tion, where the second vowel is 'e' and the third is 'i'.
৩. It means the action of repeating something that has already been said or written.

অতিরিক্ত তথ্য: Spelling rules in English often change when a verb is converted into a noun.