JMdict: 1459350

内約 【ないやく】

  1. [n,vs,vt] (marriage) engagement; secret treaty; tacit understanding; private contract
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
内 Inside, Within, Between, Among, House, Home ナイ, ダイ うち 2
約 Promise, Approximately, Shrink ヤク つづ.まる, つづ.める, つづま.やか 4