'convalescence' originates from Latin, specifically the word 'convalescere,' where 'con-' meant 'together' and 'valescere' meant 'to grow strong.'

'convalescere' transformed into the Old French word 'convalescence,' and eventually became the modern English word 'convalescence' through Middle English.

Initially, it meant 'to grow strong together,' but over time it evolved into its current meaning of 'recovery from illness.'