A Complex

1. A problem. (clarification of this definition is needed)
2. A network of interconnected systems.
3. A collection of buildings with a common purpose, such as a university or military base.
4. An assemblage of related things; a collection.
   1. An organized cluster of thunderstorms.
   2. A cluster of wildfires that have merged.
   3. (taxonomy) A group of closely related species, often distinguished only with difficulty by traditional morphological methods.
5. (psychoanalysis) An abnormal mental condition caused by repressed emotions.
6. (informal, by extension) A vehement, often excessive psychological dislike or fear of a particular thing.
7. (chemistry) A structure consisting of a central atom or molecule weakly connected to surrounding atoms or molecules.
8. (mathematics) A complex number.