An example of deontology is the belief that killing someone is wrong, even if it was in self-defense.
Origin of deontologyfrom Classical Greek deon (gen. deontos), that which is binding, necessity from dein, to bind (see diadem) + -logy
Origin of deontologyGreek deon deont- obligation, necessity ( from ) ( neuter present participle of dein to need, lack ; see deu-1 in Indo-European roots.) -logy
From Ancient Greek δέον (deon, “that which is binding, needful, right, proper”) + λόγος (logos, “argument”).