This is the 2714th most frequent Portuguese word.
publicadas
"Publicadas" means "published" in English.
Here, 'publicadas' is used as a past participle describing the news that has been published, agreeing in gender and number with 'as notícias'.
As notícias foram publicadas no jornal de hoje.
The news was published in today's newspaper.
In this case, 'publicadas' functions as a past participle modifying 'revistas' to indicate the periodic publication schedule.
Essas revistas, publicadas mensalmente, são muito informativas.
These magazines, published monthly, are very informative.
Again, 'publicadas' is used as a past participle to describe editions, showing that they were published in the given timeframe.