What does witness mean?
Witness has both a noun and a verb meaning. As a noun, it usually denotes a person who observes an event and can describe what happened, particularly a witness in a legal proceeding. More broadly, it can mean anyone present at an event, whether as a bystander, participant, or observer. In literary and formal expressions, “a witness to something” may refer to the event or quality itself as evidence, as in “a testament to her courage.” As a verb, witness means to see or observe something firsthand, as when a reporter witnesses a demonstration. It can also mean to be present at or experience something, or to formally attest to its truth. The word is common across British and American English and is especially prominent in legal, journalistic, and historical contexts. Its history is closely connected to the idea of knowing: the word’s Old English ancestor was built from wit, meaning knowledge or intelligence, and referred to testimony or the person capable of providing it.
A person who observes an event or is legally or otherwise qualified to testify about it; by extension, a person present at an event or evidence of something.
"The witness identified the man she had seen outside the station."
In legal contexts, witness may refer to a person giving testimony whether or not the person personally observed the event in question.
To observe an event firsthand, be present at it, or formally attest to its truth.
"Thousands of people witnessed the ceremony from the square."
The phrase “witness someone doing something” is common, though “observe” may sound more formal in institutional or legal writing.
The standard plural is witnesses.
"Both witnesses gave consistent accounts of the events."
A witness is literally a knower: the word descends from Old English wit, meaning knowledge, with the sense of someone who knows or can testify to what happened.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does witness come from?
The word descends from Old English witnes, meaning knowledge, testimony, or witness, formed from wit, “knowledge, intelligence,” and the suffix -ness. Old English also had witnessian, meaning to attest or bear witness, from which the modern verb developed. Related forms such as witty and witless preserve the same Germanic root, although their present meanings have diverged considerably from the original sense of knowledge.
Related word forms
How witness is actually used
Witness is neutral in ordinary contexts and especially common in legal and formal writing. “Eyewitness” is more specific because it identifies someone who personally saw an event. In formal usage, “witness to” can also mean evidence of or testimony to something.