Relating to dignitaries; characteristic of or appropriate to people of high rank, office, or importance.
From 'dignitary' (a high-ranking official) plus the adjectival suffix '-ial'. Emerged in formal English to describe behaviors, customs, and settings befitting important people.
The diplomatic world runs on dignitarial protocol—seating arrangements, speech order, even door-opening precedence are obsessively governed by invisible rules that would confuse most people!
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