IPA: /ɡrəˈtuːɪti/
KK: /grəˈtuːɪti/
A sum of money given to someone for their service, often as a thank you or reward.
After the meal, I left a gratuity for the waiter to show my appreciation.
Gratuity → It is formed from "gratus" (meaning pleasing or thankful) and the suffix "-ity" (meaning the state or quality of). The word "gratuity" refers to the state of being pleasing or the quality of being thankful, often in the context of a tip given for services rendered.
Think of 'gratus' meaning pleasing or thankful, which helps you remember that a gratuity is a way to express thanks, often through a tip.