complex

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Consisting of interconnected or interwoven parts; composite.
2. adj. Composed of two or more units: a complex carbohydrate.
3. adj. Involved or intricate, as in structure; complicated.
4. adj. Grammar Consisting of at least one bound form. Used of a word.
5. adj. Grammar Consisting of an independent clause and at least one other independent or dependent clause. Used of a sentence.
6. n. A whole composed of interconnected or interwoven parts: a complex of cities and suburbs; the military-industrial complex.
7. n. In psychology, a group of related, often repressed ideas and impulses that compel characteristic or habitual patterns of thought, feelings, and behavior. No longer in scientific use.
8. n. An exaggerated or obsessive concern or fear.
9. n. Medicine The combination of factors, symptoms, or signs of a disease or disorder that forms a syndrome.

Century Dictionary and Cyclopedia

1. Composed of interconnected parts; formed by a combination of simple things or elements; including two or more connected particulars; composite; not simple: as, a complex being; complex ideas; a complex term.
2. Involved; intricate; complicated; perplexing.
3. In the theory of numbers, any expression in the form ai + bj +, etc., where a, b, etc., are integers, and i, j, etc., are peculiar units.
4. n. Anything consisting in or formed by the union of interconnected parts; especially, an assemblage of particulars related as parts of a system.
5. n. In geometry, a continuous, triply infinite system of infinite straight lines; the whole of any kind of forms in space fulfilling one condition: thus, all the lines that cut a given curve in space constitute a complex.
6. To combine intricately; involve; mix up.

Wiktionary

1. adj. Made up of multiple parts; intricate or detailed.
2. adj. Not simple or straightforward.
3. adj. mathematics Of a number, of the form a + bi, where a and b are real numbers and i is the square root of −1.
4. adj. geometry A curve, polygon or other figure that crosses or intersects itself.
5. n. A problem.
6. n. A collection of buildings with a common purpose, such as a university or military base.
7. n. A psychologically based dislike or fear of a particular thing.
8. n. A thunderstorm that forms when two storm fronts collide.
9. n. chemistry A structure consisting of a central atom or molecule weakly connected to surrounding atoms or molecules.
10. v. chemistry, intransitive To form a complex with another substance

GNU Webster's 1913

1. adj. Composed of two or more parts; composite; not simple.
2. adj. Involving many parts; complicated; intricate.
3. n. Assemblage of related things; collection; complication.

WordNet 3.0

1. n. a conceptual whole made up of complicated and related parts
2. n. a compound described in terms of the central atom to which other atoms are bound or coordinated
3. n. a whole structure (as a building) made up of interconnected or related structures
4. adj. complicated in structure; consisting of interconnected parts
5. n. (psychoanalysis) a combination of emotions and impulses that have been rejected from awareness but still influence a person's behavior