Causal

Caus"al, n. A causal word or form of speech.

Anglo-Saxon drencan to drench, causal of Anglo-Saxon drincan to drink.
Skeat.

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.