complex.

Made 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.

Not simple, easy, or straightforward; complicated.

Having 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

Whose range is a subset of the complex numbers.

complex function

Whose coefficients are complex numbers; defined over the field of complex numbers.

complex polynomial

complex algebraic variety

A curve, polygon or other figure that crosses or intersects itself.

A network of interconnected systems.

military–industrial complex

A collection of buildings with a common purpose, such as a university or military base.

An assemblage of related things; a collection.

An assemblage of related things; a collection. An organized cluster of thunderstorms.

An assemblage of related things; a collection. A cluster of wildfires burning in the same vicinity.

The fire complex began as two separate fires.

An assemblage of related things; a collection. A group of closely related species, often distinguished only with difficulty by traditional morphological methods.

A 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.

A 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. A fixed mental tendency or obsession.

A 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.

A complex number.

A multimorphemic word, one with several parts, one with affixes.

To form a complex with another substance.

To complicate.