Dialogue (Dialectical Logic)
If you consider any two aspects of Reality, dialogue is that which happens between or among them. Practically, anything that happens between two or more things is a form of dialogue. You can think of dialogue as a 'dialectical' dynamic. Broadly, a dialectic is a process of mutual resolution of differences among things. This process seeks a harmony or equilibrium. Sometimes the dialectic has a definite end, like a point of stable equilibrium that does not wither once it is reached. Other times, harmony requires an ongoing process — intermittent or continuous — needed to keep a steady dynamic equilibrium.
The phenomenon of evolution in biological forms is dialectical in nature. It refers to a process of adaptation whereby organisms develop morphological and behavioral changes that increase their chances of survival in a given ecological context. The process is 'dialectical' because it is not only organisms that change in response to the environment and its pressures; the environment itself also changes in response to the activity of the organisms it serves as a medium for.
Added June 8th, 2021.
Etymology
dialogue. From Late Latin dialogus, from Ancient Greek διάλογος (diálogos, “conversation, discourse”), from διά (diá, “through, inter”) + λόγος (lógos, “speech, oration, discourse”), from διαλέγομαι (dialégomai, “to converse”), from διά (diá) + λέγειν (légein, “to speak”).
δια- (“of mutual relation”, “one with another”)
dialectic. From διαλέγομαι (dialégomai, “to have a conversation”) + -τῐκός (-tikós, verbal adjective suffix): literally, “related to conversation”.