Causal \Caus"al\, a. [L. causalis. See Cause.] 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.
Source: Webster's Revised Unabridged Dictionary (1913)
Causal \Caus"al\, n. A causal word or form of speech.
Anglo-Saxon drencan to drench, causal of Anglo-Saxon drincan to drink. --Skeat.