'celebratory' originates from the Latin word 'celebratus,' which is the past participle of 'celebrare,' meaning 'to celebrate.'

'celebratus' transformed into the Old French word 'celebrer,' and eventually became the modern English word 'celebrate,' from which 'celebratory' is derived.

Initially, it meant 'to honor or commemorate,' and over time it evolved into its current meaning of 'relating to celebration.'