One-word substitution (diplomacy and statecraft): Choose the term for the formal code of diplomatic etiquette, ceremonial procedure, and precedence among officials. Context: Distinguish from general statesmanship, rigid formalism, or rank ordering alone. Instruction: Select the most accurate single-word substitute.

Given data

• Phrasing: code of diplomatic etiquette and precedence.
• Options: Protocol, Statesmanship, Formalism, Hierarchy (reordered above).

Concept / Approach
Protocol is the authoritative set of rules for diplomatic conduct, ceremonies, and order of precedence.

Elimination
Protocol — rules of diplomatic conduct; correct. ✅Statesmanship — skill in governance; broader and personal quality. ❌Formalism — excessive adherence to form; not specific to diplomacy. ❌Hierarchy — rank ordering; only one aspect of protocol. ❌

Example
Embassy events follow strict protocol for seating and greetings.

Final Answer
Protocol