(1) Of, pertaining to, or based on aetiology, the study of causation.
(2) Causing a disease or a pathological condition . As in: etiological agent of a disease.
Word origin: Gk aitiología: determining the cause of something.
Related forms: etiology (noun), etiologically (adverb), etiologist (noun).
Related phrases: etiological factors, etiological diagnosis.
See also: aetiology.