'motion' originates from Latin, specifically the word 'motio,' where 'movere' meant 'to move.' 'Related' comes from Latin 'relatus,' the past participle of 'referre,' meaning 'to bring back.'

'motion' changed from the Old French word 'motion' and eventually became the modern English word 'motion.' 'Related' evolved from the Old French 'relater' and became 'related' in English.

Initially, 'motion' meant 'a moving or being moved,' and 'related' meant 'connected or associated.' These meanings have largely remained the same in modern usage.