One of the mysteries of the English language finally explained.
Under certain conditions, with a qualification; within limits. Also as adjective: qualified, conditional.
Early 17th century; earliest use found in William Fulbecke (1560–?1603), lawyer and historian. From post-classical Latin sub modo with modification from classical Latin sub + modō, ablative of modus.
sub modo/ˌsʌb ˈməʊdəʊ/
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