Ethos Definition What is ethos ? Here’s a quick and simple definition : Ethos , along with logos and pathos, is one of the three "modes of persuasion" in rhetoric (the art of effective speaking or writing). Ethos is an argument that appeals to the audience by emphasizing the speaker's credibility and authority. If the speaker has a high-ranking position, is an expert in his or her field, or has had life experience relevant to a particular topic, anything the speaker says or does to ensure ... Ethos[a][b] is a Greek word meaning "character" that is used to describe the guiding beliefs or ideals that characterize a community, nation, or ideology; and the balance between caution and passion. [1] ETHOS definition : 1. the set of beliefs, ideas, etc. about the social behaviour and relationships of a person or…. Learn more. ETHOS meaning : 1. the set of beliefs, ideas, etc. about the social behaviour and relationships of a person or…. Learn more.