Source : Webster's Revised Unabridged Dictionary (1913)

Causality \Cau*sal"i*ty\, n.; pl. {Causalities}.
   1. The agency of a cause; the action or power of a cause, in
      producing its effect.

            The causality of the divine mind.     --Whewell.

   2. (Phren.) The faculty of tracing effects to their causes.
      --G. Combe.

Source : WordNet®

causality
     n : the relation between causes and effects