'anaesthetization' originates from Greek, specifically the word 'anaisthēsia,' where 'an-' meant 'without' and 'aisthēsis' meant 'sensation.'

'anaisthēsia' transformed into the French word 'anesthésie,' and eventually became the modern English word 'anaesthetization' through adaptation in medical terminology.

Initially, it meant 'lack of sensation,' but over time it evolved into its current meaning of 'the process of making someone insensitive to pain, especially by medical means.'