'non-baptismal' originates from the prefix 'non-' meaning 'not' and 'baptismal' from 'baptism', which is derived from the Greek word 'baptisma', meaning 'to immerse'.

'baptisma' transformed into the Latin word 'baptismus', and eventually became the modern English word 'baptism', with 'non-' added to form 'non-baptismal'.

Initially, it meant 'not related to immersion or baptism', and this meaning has largely remained the same in modern usage.