"Firsthand knowledge" is knowledge gained through direct experience or observation.
Yes, I have irrefutable firsthand knowledge of this. Wowzers.
http://en.wikipedia.org/wiki/Winslow_Homer Winslow Homer
secondary source
The Mountain men's explorations provided Americans with some of the earliest firsthand knowledge of the Far West. p.s. this is Taylor lol :)
One thing that is really hot in business right now is social media. With social media, businesses can get firsthand knowledge about what their customers want.
A firsthand biography is a biography that is written by someone who has direct personal experience or knowledge of the subject. This typically involves the author having interacted with or known the individual being depicted in the biography.
Firsthand - 2003 was released on: USA: 1 July 2003
Could be spelled firsthand, one word, or first-hand.
they are a firsthand account by a slave
Firsthand data is information that is collected directly from the source or through direct experience. This type of data is considered more reliable and accurate as it is obtained firsthand rather than being interpreted or communicated by others. Examples of firsthand data include observations, surveys, interviews, and experiments.
Firsthand: obtained by, coming from, or being direct personal observation or experience "a firsthand account of the war"
Firsthand - 2003 Daniel Dhers was released on: USA: 28 December 2008