'post-relationship' originates from the prefix 'post-' meaning 'after' and the word 'relationship', which refers to a romantic or emotional connection between people.

'post-' is derived from Latin 'post', meaning 'after', and 'relationship' comes from the word 'relation', which evolved from Old French 'relacion'.

Initially, 'post-' was used to denote 'after' in various contexts, and 'relationship' referred to any connection between people. The combination specifically evolved to describe the period after a romantic relationship ends.