外交 (がいこう) combines the standard on'yomi がい for 外 (outside) and こう for 交 (associate/exchange). Misreadings like がくこう for 外 or がいこい for 交 are incorrect. It specifically refers to the practice of conducting negotiations and maintaining relations between states, encompassing the entirety of foreign affairs, rather than just isolated negotiations.
外交 (がいこう) は、外の音読み「がい」と交の音読み「こう」を組み合わせた標準的な読みです。「がくこう」や「がいこい」は読み間違い。外交は、国家間の交渉や関係維持のための活動全般を指し、国際関係そのものや個別の交渉とは異なる概念です。
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