/ɪnˌvestɪˈgeɪʃn ||; ɪnˌvɛstəˈgeʃən/noun [C,U] (an) investigation (into sth) an official examination of the facts about a situation, crime, etc （官方）调查，审查，研究: The airlines are going to carry out an investigation into security procedures at airports. 航空公司将研究机场的保安程序。The matter is still under investigation. 事情仍在调查阶段。