'invigorator' originates from Latin, specifically the word 'invigorare,' where 'in-' meant 'into' and 'vigorare' meant 'to give strength.'

'invigorare' transformed into the French word 'invigorer,' and eventually became the modern English word 'invigorate' through Middle English.

Initially, it meant 'to give strength or energy,' and this meaning has largely remained the same in modern usage.