1. [Adjective]: 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. [Noun]: a whole structure (as a building) made up of interconnected or related structures

3. [Noun]: (psychoanalysis) a combination of emotions and impulses that have been rejected from awareness but still influence a person''s behavior

4. [Noun]: a conceptual whole made up of complicated and related parts; "the complex of shopping malls, houses, and roads created a new town"

5. [Noun]: a compound described in terms of the central atom to which other atoms are bound or coordinated

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