'routinely' originates from 'routine,' which comes from the French word 'routine,' meaning 'habitual course of action.' 'Changed' comes from the Old English 'cēosan,' meaning 'to choose.'

'Routine' evolved from the French 'routine' and 'changed' from the Old English 'cēosan,' eventually forming the modern English 'routinely-changed.'

Initially, 'routine' meant 'habitual course,' and 'changed' meant 'to choose,' but together they evolved to mean 'subject to regular alteration.'