'dignitary' originates from Latin, specifically the word 'dignitas', where 'dignus' meant 'worthy' and the suffix '-ary' comes from Latin '-arius' meaning 'relating to'.

'dignitary' developed through Old French and Middle English: Latin 'dignitas' gave rise to Old French 'dignité' and Middle English 'dignite'/'dignity'; the English noun 'dignitary' was formed in the early modern period from 'dignity' + the suffix '-ary'.

Initially it referred to 'worthiness' or 'the quality of being worthy' (dignity); over time it shifted to refer to 'a person who holds a position of dignity or high office' (a high-ranking or important person).