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cach·in·nate [kak-uh-neyt]
verb (used without object), cach·in·nat·ed, cach·in·nat·ing.

1. to laugh loudly.

Origin

1815-25; < Latin cachinnātus (past participle of cachinnāre to laugh aloud, laugh immoderately), equivalent to cachinn- laugh aloud + -ātus -ate1

Synonyms

1. cackle, guffaw.