'attingent' originates from Latin, specifically the word 'attingens' (present participle of 'attingere'), where 'ad-' meant 'to, toward' and 'tangere' meant 'to touch'.

'attingent' came into Middle English from Old French 'atingent' and Latin 'attingens', and eventually became the rare/archaic English adjective 'attingent'.

Initially it meant 'touching or reaching'; over time the sense remained similar but the word became archaic and is now rare in modern English.