cor·re·la·tion 
/ˌkorəˈleɪʃən/ noun
plural cor·re·la·tions /ˌkorəˈleɪʃən/ noun : the relationship between things that happen or change together [noncount] ▪ the correlation of brain size and/with intelligence — often + between ▪ the high/strong correlation between poverty and crime [=the fact that crime is more common when there is more poverty] [count] ▪ Researchers have found a direct correlation between smoking and lung cancer. ▪ She says that there's no correlation between being thin and being happy.
