firsthand
UK: ˌfɜːstˈhænd | US: ˌfɜːrstˈhænd
adj. obtained or experienced directly from the original source
adv. in a direct manner; without intermediaries
The word "firsthand" combines "first" (Old English fyrst, meaning "foremost" or "initial") and "hand" (Old English hand, symbolizing direct involvement or action). It emerged in the 17th century to describe knowledge or experience acquired directly ("from the first hand"), contrasting with secondhand information. The metaphor reflects tactile immediacy—as if touching something with one’s own hands.
She gathered firsthand accounts from survivors of the earthquake.
The journalist reported the event firsthand.
His firsthand experience in teaching made his advice invaluable.
We need firsthand data, not hearsay.
The explorer documented his firsthand observations of the tribal culture.