'devotional' originates from the Latin word 'devotionem,' where 'devotio' meant 'a solemn vow or dedication.'

'devotionem' transformed into the Old French word 'devocion,' and eventually became the modern English word 'devotion' through Middle English.

Initially, it meant 'a solemn vow or dedication,' but over time it evolved into its current meaning of 'religious worship or service.'