Source : Webster's Revised Unabridged Dictionary (1913)

AEtiological \[AE]`ti*o*log"ic*al\, a.
   Pertaining to [ae]tiology; assigning a cause. --
   {[AE]`ti*o*log"ic*al*ly}, adv.

Source : WordNet®

aetiological
     adj 1: of or relating to the philosophical study of etiology [syn:
            {etiological}, {etiologic}, {aetiologic}]
     2: relating to the etiology of a disease; "etiological agent"
        [syn: {etiological}, {etiologic}, {aetiologic}]