complex

[kuhm-pleks, kom-pleks, kom-pleks]

adjective

1. composed of many interconnected parts; compound; composite.

   a complex highway system.

2. characterized by a very complicated or involved arrangement of parts, units, etc..

   complex machinery.

   Antonyms: simple

3. so complicated or intricate as to be hard to understand or deal with.

   a complex problem.

   Synonyms: labyrinthine, tangled, knotty
   Antonyms: simple

4. Grammar.

   1. (of a word) consisting of two parts, at least one of which is a bound form, as childish, which consists of the word child and the bound form -ish.

   2. complex sentence.

5. Mathematics.,  pertaining to or using complex numbers.

   complex methods; complex vector space.

noun

1. an intricate or complicated association or assemblage of related things, parts, units, etc..

   the entire complex of our educational system; an apartment complex.

   Synonyms: labyrinth, tangle, web, network

2. Psychology.,  a system of interrelated, emotion-charged ideas, feelings, memories, and impulses that is usually repressed and that gives rise to abnormal or pathological behavior.

3. a fixed idea; an obsessive notion.

4. Mathematics.

   1. an arbitrary set of elements of a group.

   2. a collection of simplexes having specified properties.

5. Also called coordination compound. Chemistry.,  a compound in which independently existing molecules or ions of a nonmetal complexing agent form coordinate bonds with a metal atom or ion.

6. Biochemistry.,  an entity composed of molecules in which the constituents maintain much of their chemical identity.

   receptor-hormone complex, enzyme-substrate complex.

verb (used with object)

1. Chemistry.,  to form a complex with.

verb (used without object)

1. Chemistry.,  to form a complex.

complex

/ ˈkɒmplɛks /

adjective

1. made up of various interconnected parts; composite

2. (of thoughts, writing, etc) intricate or involved

3. grammar

   1. (of a word) containing at least one bound form

   2. (of a noun phrase) containing both a lexical noun and an embedded clause, as for example the italicized parts of the following sentence: I didn't know the man who served me

   3. (of a sentence) formed by subordination of one clause to another

4. maths of or involving one or more complex numbers

noun

1. a whole made up of interconnected or related parts

   a building complex

2. psychoanal a group of emotional ideas or impulses that have been banished from the conscious mind but that continue to influence a person's behaviour

3. informal,  an obsession or excessive fear

   he's got a complex about cats

4. Also called: coordination compound. a chemical compound in which molecules, groups, or ions are attached to a central metal atom, esp a transition metal atom, by coordinate bonds

5. any chemical compound in which one molecule is linked to another by a coordinate bond

Usage

Complex is sometimes wrongly used where complicated is meant. Complex is properly used to say only that something consists of several parts. It should not be used to say that, because something consists of many parts, it is difficult to understand or analyse

Other Word Forms

• complexly adverb
• complexness noun
• overcomplex adjective
• quasi-complex adjective
• quasi-complexly adverb
• supercomplex adjective
• uncomplex adjective
• uncomplexly adverb
• uncomplexness noun

Word History and Origins

Origin of complex¹

First recorded in 1645–55; 1905–10 complex for def. 7; adjective from Latin complexus, past participle of complectī, complectere “to embrace, encompass, include,” equivalent to complect- ( complect ) + -tus past participle suffix; noun from Late Latin complexus “totality, complex” ( Latin: “inclusion, grasping, embrace”), equivalent to complect(ere) + -tus suffix of verb action; reanalysis of the Latin verb as “to intertwine (completely)” influenced sense of the adjective

Word History and Origins

Origin of complex¹

C17: from Latin complexus, from complectī to entwine, from com- together + plectere to braid

Example Sentences

They told me their colleagues have got a "messiah complex - ever since Margaret they think there is a leader out there who will lead them to the promised land".

From BBC

A studio-side source who was not authorized to comment said that the WGA health plan faces “complex financial challenges that require a balanced approach to align with market norms and ensure long-term stability.”

From Los Angeles Times

The continuous battle of ensuring retained firefighters' right to a pension is a "complex matter", says the FBU's national officer Mark Rowe.

From BBC

“Reputation‘s” slow-burn hit “Don’t Blame Me” follows a similar playbook, using a killer choral backing to achieve the same hymnal quality that complex vocal layering creates on “Elizabeth Taylor.”

From Los Angeles Times

“Essentially, they’re the condos and apartment complexes of the animals that live on our coastline. When they disappear, the animals have no place to live.”

From Los Angeles Times

Related Words

• complicated 
• convoluted 
• disturbing 
• intricate 
• obscure 
• perplexing 
• sophisticated