Which term signifies a bitter, abusive denunciation?

The term that signifies a bitter, abusive denunciation is "diatribe." This word is commonly used to describe a forceful and bitter verbal attack against someone or something, often characterized by harsh criticism and emotional intensity. Diatribes are typically used to express strong discontent or condemnation, and they can be found in various forms of discourse, including political speeches, social critiques, and personal arguments.

Understanding the nuance of "diatribe" is essential, as it conveys not just disagreement but also a deeply rooted animosity towards the subject being criticized. This makes it a powerful term in discussions involving serious reproach. The other terms listed do not convey this specific meaning; for example, "dichotomy" pertains to a division into two contrasting parts, "didactic" relates to teaching or instruction, and "discrete" refers to distinct or separate entities. Thus, "diatribe" stands out as the correct choice due to its clear association with abusive denunciation.