Definition of contradict verb from the Oxford Advanced American Dictionary

      

    contradict

     verb
    verb
    NAmE//ˌkɑntrəˈdɪkt//
     
    Verb Forms present simple I / you / we / they contradict
     
    he / she / it contradicts
     
    past simple contradicted
     
    -ing form contradicting
     
     
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  1. 1to say that something that someone else has said is wrong, and that the opposite is true contradict something All evening her husband contradicted everything she said. contradict somebody/yourself You've just contradicted yourself (= said the opposite of what you said before). contradict (somebody) + speech “No, it's not,” she contradicted (him).
  2. 2contradict something contradict each other (of statements or pieces of evidence) to be so different from each other that one of them must be wrong The two stories contradict each other. This version of events was contradicted by eye-witness reports. Language Bankevidencegiving proof New evidence has been found that/Studies have shown that TV advertising influences what children buy. It is clear from numerous studies that TV advertising influences what children buy. Recent research demonstrates that TV advertising influences children's spending habits. Many parents think that TV advertising influences their children. This view is supported by the findings of a recent study, which show a clear link between television advertisements and children's spending habits. The findings also reveal that most children are unaware of the persuasive purpose of advertising. Little evidence has been found that children understand the persuasive intent of advertising. The results contradict claims that advertising is unrelated to children's spending habits. Manufacturers argue that it is difficult to prove that advertising alone influences what children buy.
See the Oxford Advanced Learner's Dictionary entry: contradict