Tiedoiltaan

Tiedoiltaan is a Finnish adverbial phrase meaning "to the best of one's knowledge" or "as far as one knows." It is used to hedge statements by signaling that the information reflects the knowledge of a person rather than independently verified facts.

The phrase is formed from the noun tieto (knowledge) and an ablative-sourced construction, commonly conveying that the knowledge comes from a specific person. It is most typical in formal written Finnish, including journalism, academic writing, and official statements, where hedging is often appropriate.

In everyday speech, speakers often use other hedges such as "tietojeni mukaan" or "tietoihini" depending on context, but "tiedoiltaan" remains standard in more formal discourse. The expression highlights whose knowledge is being referenced rather than presenting information as an objective fact.

Related phrases include "tietojen mukaan" (according to the information) and "tietojensa mukaan" (according to his or her information). The form is one of several Finnish structures used to qualify statements and indicate reliance on a person’s knowledge rather than on independently verified data.