'non-supernatural' originates from English, formed by the prefix 'non-' meaning 'not' and the adjective 'supernatural' meaning 'beyond or above nature'.

'supernatural' entered English from Late Latin 'supernaturalis' (super- 'above' + 'naturalis' from Latin 'natura' meaning 'birth, nature') and was used in Middle and Early Modern English; the negative prefix 'non-' (from Latin 'non') was later joined to form the compound 'non-supernatural'.

Initially, 'supernatural' meant 'above or beyond nature'; over time it came to denote phenomena outside scientific explanation or ordinary natural laws. 'Non-supernatural' straightforwardly negates that sense, meaning 'not beyond nature' or 'explained by natural causes'.