'non-denominational' originates from the prefix 'non-' meaning 'not' and 'denominational' from 'denomination,' which refers to a recognized autonomous branch of the Christian Church.

'Denomination' comes from the Latin word 'denominatio,' meaning 'naming' or 'designation.'

Initially, it referred to the act of naming or designating, but over time it evolved to refer to religious sects and eventually to the concept of being outside such sects.