earwitness UK /ˈɪə̯wɪtnəs/US /ˈɪɹwɪtnəs/noun 1verb 1forms 3 noun1 •A witness who provides evidence or testimony based on auditory observations.In December 1996 almost the entire front page of a daily newspaper was devoted to the report of a court case involving earwitness testimony. — 1999 verb1 •To hear an event or incident directly. formsearwitnessed · earwitnessing · earwitnesses