'analgesis' originates from Greek, specifically the word 'analgēsia,' where 'an-' meant 'without' and 'algēsis' meant 'sense of pain.'

'analgēsia' was adopted into New Latin as 'analgesia,' and eventually became the modern English word 'analgesis.'

Initially, it meant 'absence of pain,' and this meaning has remained the same in modern usage.