One of the mysteries of the English language finally explained.
The principle that whatever is affirmed or denied of an entire class or kind may be affirmed or denied of any part of it.
Mid 17th century; earliest use found in George Havers (fl. 1665). From post-classical Latin dictum de omni et nullo, i.e. ‘dictum concerning every and none’ from classical Latin dictum + de + omni, ablative neuter of omnis all, every + et and + nūllō, ablative neuter of nūllus no.
dictum de omni et nullo/ˈdɪktəm deɪ ˈɒmni ɛt ˈnʊləʊ/
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