caus ‧ al /ˈkɔːz ə l $ ˈkɒː-/ BrE AmE adjective
1 . relating to the connection between two things, where one causes the other to happen or exist ⇨ cause
causal relationship/link/factor etc
a causal relationship between unemployment and crime
2 . technical a causal ↑ conjunction , such as ‘because’, introduces a statement about the cause of something
—causally adverb