Select the INCORRECTLY spelt word.

The incorrectly spelt word is "titilate". The correct spelling is Titillate which means to excite or interest somebody deliberately, especially in a sexual way

The other words are spelled correctly.

Here is a breakdown of the correct spellings of the words:

• Aggravate: to make something worse.
• Mediate: to act as a neutral person between two parties in a disagreement in order to help them reach an agreement.
• Initiate: to begin or start something.