Did you already see Tofugu's public, financial announcement?
Tofugu decided to put up an important public notice about Koichi in an official telegram.
There is a law in Japan called the Electronic Public Notice Regulation. Do you have anything like that in your country?
A public announcement is a public notice.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.