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The Japanese word

自衛

is pronounced
ziei | じえい
means
self-defense
Examples:
ボーイング社は海上自衛隊用の飛行艇を開発しました。
bōingu sha wa kaijō jieitai yō no hikō tei o kaihatsu shi mashi ta.
Boeing developed a flying boat for the Maritime Self-Defense Force.
Examples sourced from tatoeba.org