1A fact — something that actually happened or truly exists, as distinguished from opinion or imagination and backed by evidence or observation. Also used adverbially in the form「事実、〜」to mean "in fact" or "actually."
事実、彼はその日一度も会社に姿を見せなかった。
In fact, he never showed up at the office that day.
噂ではなく、事実に基づいて話してください。
Please speak based on facts, not rumors.
どんなにつらくても、事実から目を背けるわけにはいかない。
No matter how painful it is, we can't turn away from the facts.
彼が犯人であるという事実は動かしようがない。
The fact that he is the culprit is undeniable.