'knowledge' originates from Old English, specifically the word 'cnāwan,' where 'cnāw-' meant 'to know.' 'Focus' originates from Latin, specifically the word 'focus,' meaning 'hearth' or 'fireplace.'

'knowledge' changed from the Old English word 'cnāwan' and eventually became the modern English word 'knowledge.' 'Focus' remained largely unchanged from Latin to modern English.

Initially, 'knowledge' meant 'to know or recognize,' and 'focus' meant 'hearth.' Over time, 'focus' evolved to mean 'center of activity or interest.'