trichotomy (noun)

1. In the fantasy novel, there exists a trichotomy of magical beings: witches, wizards, and warlocks.

2. The cartoon showcased a trichotomy between the hero, the sidekick, and the villain.

3. The modern house had a trichotomy of materials used in its construction: steel, glass, and concrete.

4. The fashion show presented a trichotomy of outfits: casual, formal, and avant-garde.