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(1)   Complicated in structure; consisting of interconnected parts
"A complex set of variations based on a simple folk melody"
"A complex mass of diverse laws and customs"


(2)   A whole structure (as a building) made up of interconnected or related structures
(3)   A conceptual whole made up of complicated and related parts
"The complex of shopping malls, houses, and roads created a new town"
(4)   (psychoanalysis) a combination of emotions and impulses that have been rejected from awareness but still influence a person's behavior
(5)   A compound described in terms of the central atom to which other atoms are bound or coordinated


From , from , pp. of , from and .


  1. Made up of multiple parts; intricate or detailed.
  2. Not simple or straightforward.
  3. Of a number, of the form a + bi, where a and b are real numbers and i is the square root of −1.
    complex function
  4. A curve, polygon or other figure that crosses or intersects itself.


detailed, intricate complicated, difficult, hard, involved, tough



  1. A problem.
  2. A collection of buildings with a common purpose, such as a university or military base.
  3. A psychologically based dislike or fear of a particular thing.
    Jim has a real complex about working for a woman boss.
  4. A thunderstorm that forms when two storm fronts collide.
  5. A structure consisting of a central atom or molecule weakly connected to surrounding atoms or molecules.


  1. To form a complex with another substance