What does the word gratuity mean?

  /grəˈtuɪti, -ˈtyu-/ Show Spelled Pronunciation [gruh-too-i-tee, -tyoo-] Show IPAUse gratuity in a Sentence
-noun, plural -ties. 1. a gift of money, over and above payment due for service, as to a waiter or bellhop; tip. 2. something given without claim or demand. 3. British. a. a bonus granted to war veterans by the government. b. a bonus given military personnel on discharge or retirement.
---- Origin:
1515-25; < MF gratuite, equiv. to L grātuī(tus) free + MF -te -ty 2