What is the definition of ascertained?

Ascertained means to find out something with certainty. It implies a process of investigation, inquiry, or research that leads to a definitive conclusion.

Here are some synonyms for ascertained:

* Determined

* Established

* Discovered

* Verified

* Confirmed

Examples:

* "The police have ascertained the identity of the suspect."

* "We need to ascertain the accuracy of the data before making any decisions."

* "The doctor ascertained that the patient was suffering from pneumonia."

In short, when something is ascertained, it is no longer a matter of doubt or speculation.