Final answer:
The defining features of Aristotle's rhetoric and Plato's dialectic lie in the art of persuasion and the pursuit of truth through logical reasoning.
Step-by-step explanation:
Aristotle's rhetoric and Plato's dialectic have distinct defining features. Aristotle's rhetoric, as analyzed in his book 'Rhetoric', focuses on the art of spoken persuasion and the use of ethos, logos, pathos, and kairos to effectively persuade an audience. On the other hand, Plato's dialectic emphasizes a structured debate or discussion between individuals with differing views in order to seek truth and knowledge through logical reasoning and collaboration.