'contentious' originates from Latin, specifically the word 'contentiosus,' where 'contentio' meant 'strife or dispute.' 'Arrange' comes from Old French 'arangier,' meaning 'to set in a row.'

'contentious' evolved from the Latin 'contentiosus' through Old French 'contentieux,' and 'arrange' transformed from Old French 'arangier' to the modern English 'arrange.'

Initially, 'contentious' meant 'inclined to argue,' but over time it evolved to describe anything likely to cause disagreement.