ætiologically,adv.|ˌiːtɪəʊˈlɒdʒɪkəlɪ, ˈɛtɪ-| [f.prec. + -ly2.] In an ætiological manner; so as to assign a cause or reason. 1849W. Fitzgerald Whitaker's Disput. 403 Scripture is expounded ætiologically, when it is shewn why any thing was done or said.