'tension' originates from Latin, specifically the word 'tensio,' where 'tendere' meant 'to stretch.' 'Related' comes from Latin 'relatus,' the past participle of 'referre,' meaning 'to bring back.'

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

Initially, 'tension' meant 'the act of stretching,' but over time it evolved into its current meaning of 'mental or emotional strain.' 'Related' has maintained its meaning of 'connected or associated with.'