dichotomy (noun)

1. The protagonist in the anime series represents the dichotomy of light and darkness within himself.

2. In Greek mythology, the concept of love and desire is often portrayed as a dichotomy between Aphrodite and Eros.

3. The rise and fall of the Roman Empire is a significant dichotomy that shaped the course of history.

4. The dichotomy between passion and rationality is a common theme in many romantic novels.