Definitions:

1. Means cheerful, laughing, or smiling. ADJECTIVE
   • The children's riant faces lit up the room with their infectious laughter.
2. Used to describe a joyful or merry demeanor, often implying an expression or atmosphere filled with happiness or laughter. ADJECTIVE
   • The riant laughter of friends filled the air as they celebrated a joyous occasion.

Synonyms:

• cheerful
• convivial
• festive
• gleeful
• happy
• jolly
• laughing
• lively