Entry 2 senses Webster, 1913 Ethology /ĭth-äl'-əj-ē/ · E·thol·o·gy · IPA /ɪˈθɑl.ə.d͡ʒi/ 01 n. A treatise on morality; ethics. 1. A treatise on morality; ethics. 2. The science of the formation of character, national and collective as well as individual.