'arrondi' originates from French, specifically the past participle of the verb 'arrondir', where the prefix 'a-' (from Latin ad-) meant 'to' and the root 'rond' (from Latin 'rotundus') meant 'round'.

'arrondi' developed from Old French forms based on 'arrondir', which in turn descends from Vulgar Latin *rotundāre (related to Latin 'rotundus' meaning 'round'); the modern French past participle became the borrowed/used form 'arrondi'.

Initially it meant 'made round' or 'caused to be round'; over time it has come to mean both the action/result of rounding (including numerical rounding) and the quality of being rounded or having rounded edges.