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

  

because

 conjunction
conjunction
BrE BrE//bɪˈkɒz//
 
, BrE//ˈkʌz//
 
; NAmE NAmE//ˈkɔːz//
 
, NAmE//ˈkʌz//
 
 
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for the reason that I did it because he told me to. Just because I don't complain, people think I'm satisfied. Express YourselfGiving reasons, justifying a choiceIn various exams, you are asked to make a choice and give reasons for it. In conversation or in a meeting, you need to explain and justify your decisions: There are two main reasons why I think it’s the best option: first, there's the cost and second, the quality. I think/​believe it's the right thing to do because it gives everyone a fair chance. I would choose the newer one on the grounds that it will last longer. Of the three houses, the largest one seems to me to be the best, because they need the room. My choice would be number 3, simply because it's the clearest design. Word Origin Middle English: from the phrase by cause, influenced by Old French par cause de ‘by reason of’.
See the Oxford Advanced American Dictionary entry: because