- trichotomy (mathematics), in the mathematical field of order theory
- trichotomy (philosophy), for the idea that man has a threefold nature
- In taxonomy, a trichotomy is speciation of three groups from a common ancestor, where it is unclear or unknown in what chronological order the three groups split.
A trichotomy is a splitting into three parts, and, apart from its normal literal meaning, can refer to:
- Tripartite (disambiguation)
trichotomous in German: Trichotomie
trichotomous in Estonian: Trihhotoomia