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.

Made up of multiple parts; composite; not simple. / Not simple, easy, or straightforward; complicated.

(chemistry) The relative ability to form a chemical complex

plural of complexability

(uncountable) The state of being complex; intricacy; entanglement. / (countable) That which is and renders complex; intricacy; complication.

plural of complex

Third-person singular simple present indicative form of complex

(chemistry) The formation of a complex

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