A problem. / A network of interconnected systems. / A collection of buildings with a common purpose, such as a university or military base. / An organized cluster of thunderstorms.

(chemistry, intransitive) To form a complex with another substance / (transitive) To complicate.

plural of complexability

(chemistry) The relative ability to form a chemical complex

difficult, not easy to understand or explain

simple past tense and past participle of complex

(chemistry) Combined in the form of a complex / (obsolete) complex, complicated

present participle of complex

(chemistry) The formation of a complex; complexation

plural of complexing