expression, noun
common knowledge; well-known fact
A set phrase used to state that something is widely known and accepted as true. Often used in formal or explanatory contexts.
彼が優れた研究者であることは周知の事実だ。
It is common knowledge that he is an outstanding researcher.
Compound of 周知 (shūchi, 'common knowledge') + の (no, possessive particle) + 事実 (jijitsu, 'fact').