“Public announcement” in Japanese
Short answer
Public announcement in Japanese is “公示” (kouji). Full meaning: public announcement, official notice, edict.
Other ways to say “Public announcement” in Japanese
公告
koukoku public announcement, official notice
館内放送
kannaihousou public announcement (in a department store, etc.), announcement over an (indoor) public address system
諭告
yukoku admonition, public announcement
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