common knowledge; widely known
Used to describe something that is known throughout society or by everyone. Often appears in formal or written contexts.
That fact has become common knowledge.
His misconduct is a widely known fact.
周知 means 'common knowledge' or 'well-known' and is more general. 世間周知 emphasizes that the knowledge is widespread throughout society.
世間 means 'society' or 'the world of people'. 世間周知 combines this with 周知 to stress societal awareness.
Compound of 世間 (society, the world) and 周知 (common knowledge). The exact historical derivation is uncertain, but the word is a straightforward combination of these two elements.