caus·al /ˈkɔzəl/
(a.)原因的,因果關係的,表示原因或理由的表示原因的詞
Caus·al a. Relating to a cause or causes; inplying or containing a cause or causes; expressing a cause; causative.
Causal propositions are where two propositions are joined by causal words. --Watts.
Caus·al, n. A causal word or form of speech.
Anglo-Saxon drencan to drench, causal of Anglo-Saxon drincan to drink. --Skeat.
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causal
adj : involving or constituting a cause; causing; "a causal
relationship between scarcity and higher prices"