Formal term for an official announcement or directive, often from a government office or organization.
An official notice was issued by the city office.
A new official notice was issued from the prefectural office.
The company received an official notice from headquarters.
All staff acted in accordance with the official notice.
通達 and 達し both mean an official notice, but 通達 is the standard term in business and administrative writing, while 達し sounds more old-fashioned or bureaucratic.
告知 is a general term for making something publicly known, whereas 達し specifically implies a directive issued by an official body.
到達 means 'arrival' or 'reaching a goal' and shares the kanji 達 with 達し, but it has nothing to do with an official notice.
official notice; directive from above · Edo-period official proclamation
Standard kanji spelling; used in official contexts.
Ateji spelling; rarely used.
Derived from the verb 達する (たっする, 'to reach; to notify'), with the nominalized form 達し used as a noun meaning 'notification'.