One of the mysteries of the English language finally explained.
By way of extreme caution; as an added precaution.
Late 17th century. From post-classical Latin ex abundante cautela by way of extreme caution from classical Latin ex + abundante, ablative singular of abundāns + cautēlā, ablative of cautēla.
ex abundante cautela/ɛks əbʌnˈdanti kɔːˈtiːlə//ɛks əbʊnˈdanteɪ kaʊˈteɪlə/
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