\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.

\Caus"al\, n.
A causal word or form of speech.
      Anglo-Saxon drencan to drench, causal of Anglo-Saxon
      drincan to drink.                        --Skeat.