かいこく 開国 Common word LinksSentence search for 開国Sentence search for かいこくKanji details for 開 and 国Edit in JMdict Noun, Suru verb, Intransitive verb1. founding a countryNoun, Suru verb, Intransitive verb2. opening of a country (e.g. Japan) to the world; ending (a policy of) national seclusionSee also 鎖国 Discussions Log in to talk about this word.