After that Richard, the third of that name, king in fact only, but tyrant both in title and regiment [ …] was [ …] overthrown and slain at Bosworth Field; there succeeded in the kingdom [ …] Henry the Seventh.
Munchkins are in fact one of the Healthiest [sic] of the registered cat breeds.
The pluripotency of archaeocytes is well-illustrated by the fact that they are not only involved in regenerative processes but are also at the origin of gametogenesis in many species [19 ].
Some individuals have overlooked the fact that at such low pitch their voices fade to inaudibility at the ends of sentences, or scrape down to vocal fry.
Used in the Ending of Sentence
Ah, you "believe". You do not know. So you admit that it's just wishful thinking, an ass pull not based on any facts.
I couldn't get across to the board this simple economic fact.
Meaning of fact for the defined word.
Grammatically, this word "fact" is an interjection. It's also a noun, more specifically, a countable noun.