国際 (こくさい) Japanese meaning

国際 (こくさい) Japanese meaning | Kotomora

Kanji

世せ界かい的てきN3sense 1
世界的 means 'worldwide, global in scope', while 国際 focuses on relations or exchange between specific nations.
外がい交こうN3sense 2
外交 is the modern word for official dealings between states, covering the meaning that 国際 expressed in its now-obsolete diplomatic sense.
インター
国際 is the native Sino-Japanese word for international and is used broadly and formally, while インター is a katakana clipping used mostly inside compound names.
万ばん国こく
国際 is the everyday word for 'international' in modern Japanese, while 万国 is a more literary term used mainly in set compounds like 万国旗.

国こく内ないN4sense 1
国内 means 'domestic, within the country', the direct opposite of 国際, which means 'between nations'.

国こく際さい的てきN1
国際 is a noun used attributively before another noun (国際関係), whereas 国際的 is a na-adjective that can stand alone or modify with な (国際的な問題).
異い文ぶん化かN2
異文化 focuses on cultural difference itself, whereas 国際 means 'international' and concerns relations between nations, so the two are easily mixed in phrases like 異文化交流 vs 国際交流.
国こく内ないN4
国内 refers strictly to matters within one country, whereas 国際 concerns relations or activities between multiple countries.

国こく際さいUsage100%
Standard modern spelling; commonly used before another noun, as in 国際会議 and 国際関係.
國こく際さいUsage<1%
search-only kanji form
Old-character form of 国際; useful for searching older texts or traditional-style writing, but not the normal modern spelling.

A Sino-Japanese compound of 国, 'country', and 際, 'between, border, occasion'; the spelling transparently points to matters between countries.