Correct spelling for the English word "factest" is [fˈaktəst], [fˈaktəst], [f_ˈa_k_t_ə_s_t] (IPA phonetic alphabet).
"Factest" is not a recognized word in standard dictionaries. It is possible that the term you're referring to has emerged or gained popularity in a particular context or jargon but has not been widely acknowledged yet.
However, based on the structure of the word, "factest" seems to be a combination of the noun "fact" and the superlative suffix "-est" which is used to indicate the highest degree of a quality. In this abstract sense, "factest" could be interpreted as a term to describe the most factual or the strongest fact among a set of facts.
As an example, if we consider a group of statements, one of them might be the "factest" if it is the most reliably supported by evidence or if it holds greater certainty and truth value compared to the other statements.
It is important to note that without further information or specific usage within a particular domain, the term "factest" lacks an established definition and usage in common language.