evidenceevidenceevidencesevidencedevidencingnoun (no plural)the facts, signs or objects that make you believe that something is true: The police searched the room, looking for evidence. There is evidence of a link between smoking and cancer.grammarEvidence does not have a plural so we cannot say ‘an evidence’. Instead we say ‘a piece of evidence’.give evidenceto say what you know about somebody or something in a court of law: The man who saw the accident will give evidence in court.