'tentatively-assigned' originates from the combination of 'tentative' and 'assign'. 'Tentative' comes from Latin 'tentativus', meaning 'trying, testing', and 'assign' comes from Latin 'assignare', meaning 'to mark out'.

'tentative' evolved from the Latin 'tentativus' through Old French 'tentatif', and 'assign' evolved from Latin 'assignare' through Old French 'assigner'.

Initially, 'tentative' meant 'trying or testing', and 'assign' meant 'to mark out'. Together, they evolved to mean 'assigned on a temporary basis'.