'eternally-kept' originates from the combination of 'eternal' and 'kept', where 'eternal' comes from Latin 'aeternalis', meaning 'everlasting', and 'kept' is the past participle of 'keep', from Old English 'cēpan', meaning 'to seize or hold'.

'eternal' evolved from the Latin 'aeternalis' through Old French 'eternel', and 'kept' from Old English 'cēpan', eventually forming the modern English compound 'eternally-kept'.

Initially, 'eternal' meant 'everlasting', and 'kept' meant 'held or preserved'. The compound 'eternally-kept' retains the meaning of being preserved forever.