'externally-administered' originates from the combination of 'external' and 'administered'. 'External' comes from Latin 'externus', meaning 'outside', and 'administered' is derived from Latin 'administrare', meaning 'to manage'.

'externus' transformed into the Old French word 'externe', and eventually became the modern English word 'external'. 'Administrare' evolved into the Old French 'administrer', leading to the modern English 'administer'.

Initially, 'external' meant 'outside', and 'administer' meant 'to manage'. The combined term 'externally-administered' retains these meanings, referring to management from an outside source.