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A **trichotomy** is a splitting into three parts, and, apart from its normal literal meaning, can refer to:

- Trichotomy (mathematics), mathematical field of order theory that every real number is either positive, negative, or zero
- Trichotomy theorem, in finite group theory
- Trichotomy (philosophy), series of three terms used by various thinkers
- Trichotomy (speciation), three groups from a common ancestor, where it is unclear or unknown in what chronological order the three groups split

## See also

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