Definitions:

1. Describes an intense, hearty, and often excessive outburst of laughter. NOUN
   • His hearty cachinnation echoed through the halls, brightening everyone's mood.
2. Loud, convulsive laughter. NOUN
   • She couldn't contain her cachinnation as her friend recounted the embarrassing incident at work.
3. Refers to loud, boisterous, or uncontrollable laughter. NOUN
   • Her sudden cachinnation startled everyone in the quiet library.

Synonyms:

• cackle
• chortle
• chuckle
• guffaw
• laughter
• titter