Definition of because conjunction from the Oxford Advanced American Dictionary

  

because

 conjunction
conjunction
NAmE//bɪˈkʌz//
 
, NAmE//bɪˈkɔz//
 
 
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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.
 
preposition They are here because of us. He walked slowly because of his bad leg. Because of the children's presence, I said nothing about it.
Language Bankbecause ofexplaining reasons The number of people with diabetes is growing, partly because of an increase in levels of obesity. The number of overweight children has increased dramatically in recent years, largely as a result of changes in diet and lifestyle. The increase in childhood obesity is largely due to/the result of changes in lifestyle and diet over the last twenty years. Many obese children are bullied at school on account of their weight. Part of the problem with treating childhood obesity stems from the fact that parents do not always recognize that their children are obese. Childhood obesity may be caused by genetic factors as well as environmental ones.
See the Oxford Advanced Learner's Dictionary entry: because