/ɔ:ˈθɒrətətɪv; US -teɪtɪv ||; ɔˈθɑrəˌtetɪv/adj1 having authority; demanding or expecting that people obey you 有权力；要人服从的: an authoritative tone of voice 权威的口吻
2 that you can trust because it/he/she has a lot of knowledge and information （因信息丰富）可信赖的，权威的: They will be able to give you authoritative advice on the problem. 他们能够就问题提供权威的意见。