Cachinnate definitions

kăk'ə-nāt'
To cachinnate is to laugh loudly or laugh hard.

When you give a big, loud laugh at a joke, this is an example of a time when you cachinnate.

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To laugh hard, loudly, or convulsively; guffaw.
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To laugh loudly or too much.
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(intransitive) To laugh loudly, immoderately, or too often.

The villain began to cachinnate and twirl his moustache.

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Origin of cachinnate

From Latin cacchinō (“laugh aloud”), an onomatopoeia.