/ ˈkɔːzl; NAmE / adjective
1.
( formal ) connected with the relationship between two things, where one causes the other to happen :
the causal relationship between poverty and disease
2.
causal conjunction / connective ( grammar ) a word such as because that introduces a statement about the cause of sth
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WORD ORIGIN
late Middle English (as a noun denoting a causal conjunction or particle): from late Latin causalis , from Latin causa cause.