Declan

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The Japanese word

納得

is pronounced
nattoku | なっとく
means
consent, assent, understanding, agreement, comprehension, grasp
Examples:
けい子と一朗が納得ずくで別れた。
keiko to ichi rō ga nattoku zuku de wakare ta.
Keiko and Ichiro parted with mutual consent.
私は両親に結婚を納得してもらうことが出来た。
watashi wa ryōshin ni kekkon o nattoku shi te morau koto ga deki ta.
I was able to get my parents to consent to my marriage.
Examples sourced from tatoeba.org