ascertain
verb (used with object)
to find out definitely; learn with certainty or assurance; determine.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
I am ascertaining the limit of the inferior snow in these latitudes, which I fancy will be 3,500 feet.
From Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries by William Griffith