Definition of whereas conjunction from the Oxford Advanced Learner's Dictionary

        

    whereas

     conjunction
    conjunction
    BrE BrE//ˌweərˈæz//
     
    ; NAmE NAmE//ˌwerˈæz//
     
     
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  1. 1  used to compare or contrast two facts Some of the studies show positive results, whereas others do not. We thought she was arrogant, whereas in fact she was just very shy. Language BankcontrastHighlighting differences This survey highlights a number of differences in the way that teenage boys and girls in the UK spend their free time. One of the main differences between the girls and the boys who took part in the research was the way in which they use the Internet. Unlike the girls, who use the Internet mainly to keep in touch with friends, the boys questioned in this survey tend to use the Internet for playing computer games. The girls differ from the boys in that they tend to spend more time keeping in touch with friends on the telephone or on social networking websites. Compared to the boys, the girls spend much more time chatting to friends on the telephone. On average the girls spend four hours a week chatting to friends on the phone. In contrast, very few of the boys spend more than five minutes a day talking to their friends in this way. The boys prefer competitive sports and computer games, whereas/while the girls seem to enjoy more cooperative activities, such as shopping with friends. When the girls go shopping, they mainly buy clothes and cosmetics. The boys, on the other hand, tend to purchase computer games or gadgets.
  2. 2(law) used at the beginning of a sentence in an official document to mean ‘because of the fact that…’
See the Oxford Advanced American Dictionary entry: whereas