'fixed' originates from Latin, specifically the word 'fixus,' where 'fix-' meant 'to fasten or attach.' 'Temperature' originates from Latin, specifically the word 'temperatura,' where 'temperare' meant 'to moderate or regulate.'

'fixus' transformed into the Old French word 'fixer,' and eventually became the modern English word 'fixed.' 'Temperatura' transformed into the Old French word 'temperature,' and eventually became the modern English word 'temperature.'

Initially, 'fixed' meant 'fastened or attached,' and 'temperature' meant 'moderate or regulate.' Over time, 'fixed-temperature' evolved to mean 'a constant or unchanging temperature.'