CACHINNATE Meaning of CACHINNATE in English [ 'kakɪneɪt ]■ verb literary laugh loudly.Derivativescachinnation noun OriginC19 (earlier (C17) as cachinnation ): from L. cachinnat- , cachinnare 'laugh loudly'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004