What is the definition of the word verisimilitude?

Verisimilitude is the quality of "being true or real". For instance, a news article that has many sources, first-hand witnesses, and hours of fact-checking would be said to have verisimilitude as it is most likely the truth.

In art or literature, being verisimilar is the depiction of realism, or being relatively realistic of the world we know to be "real". Science Fiction novels are not verisimilar, while a non-fiction work giving first-hand accounts of the 9/11 terrorist attack would be considered verisimilar.