Definitions
1.AdjectiveMade up of multiple parts; composite; not simple."a complex being; a complex idea; The human body is a complex system made up of many layers."
2.AdjectiveNot simple, easy, or straightforward; complicated.
3.AdjectiveHaving the form a + bi, where a and b are real numbers and i is (by definition) the imaginary square root of −1."complex number; function of a complex variable"
4.AdjectiveWhose range is a subset of the complex numbers."complex function"
5.AdjectiveWhose coefficients are complex numbers; defined over the field of complex numbers."complex polynomial; complex algebraic variety"
6.AdjectiveA curve, polygon or other figure that crosses or intersects itself.
7.NounA network of interconnected systems."military–industrial complex"
8.NounA collection of buildings with a common purpose, such as a university or military base.
9.NounAn assemblage of related things; a collection.
An organized cluster of thunderstorms.
A cluster of wildfires burning in the same vicinity."The fire complex began as two separate fires."
10.NounAn organized cluster of thunderstorms.
11.NounA cluster of wildfires burning in the same vicinity."The fire complex began as two separate fires."
12.NounA group of closely related species, often distinguished only with difficulty by traditional morphological methods.
13.NounA group of emotionally charged ideas or mental factors, unconsciously associated by the individual with a particular subject, arising from repressed instincts, fears, or desires and often resulting in mental abnormality."Jim has a real complex about working for a woman boss."
14.NounA fixed mental tendency or obsession.
15.NounA structure consisting of a central atom or molecule weakly connected to surrounding atoms or molecules, as for example coordination compounds in inorganic chemistry and protein complexes in biochemistry.
16.NounA complex number.
17.NounA multimorphemic word, one with several parts, one with affixes.
18.VerbTo form a complex with another substance.
19.VerbTo complicate.