na-adjective, noun which may take the genitive case particle 'no', noun
important; principal; pivotal; key; cardinal
Formal, somewhat literary term for something of central or crucial importance. Often used in political, organizational, or strategic contexts.
彼は党内で枢要な地位を占めている。
He holds a key position within the party.
この港は国際貿易の枢要な拠点だ。
This port is a pivotal hub for international trade.
Compound of 枢 (pivot, hinge) and 要 (essential point, necessity). The combination conveys the idea of a central, indispensable element.