| complex | (adjective) complicated in structure; consisting of interconnected parts | - |
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| (adjective) difficult to analyze or understand | Synonyms: complicated |
| (noun) a whole structure (as a building) made up of interconnected or related structures | Synonyms: building complex |
| (noun) a conceptual whole made up of complicated and related parts | Synonyms: composite |
| (noun) (psychoanalysis) a combination of emotions and impulses that have been rejected from awareness but still influence a person's behavior | - |
| (noun) a compound described in terms of the central atom to which other atoms are bound or coordinated | Synonyms: coordination compound |
| duplex | (adjective) allowing communication in opposite directions simultaneously | - |
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| (adjective) (used technically of a device or process) having two parts | - |
| (noun) an apartment having rooms on two floors that are connected by a staircase | Synonyms: duplex apartment |
| (noun) a house with two units sharing a common wall | Synonyms: duplex house, semidetached house |
| (verb) change into a duplex | - |
| googolplex | (noun) a cardinal number represented as 1 followed by a googol of zeros (ten raised to the power of a googol) | - |
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| multiplex | (adjective) having many parts or aspects | - |
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| (adjective) many and varied; having many features or forms | Synonyms: manifold |
| (noun) a movie theater that has several different auditoriums in the same building | - |
| (noun) communicates two or more signals over a common channel | - |
| perplex | (verb) make more complicated | Synonyms: complicate |
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| (verb) be a mystery or bewildering to | Synonyms: amaze, baffle, beat, bewilder, dumbfound, flummox, get, gravel, mystify, nonplus, pose, puzzle, stick, stupefy, vex |
| quadruplex | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplicate |
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| simplex | (adjective) having only one part or element | - |
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| (adjective) allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time | - |
| triplex | (adjective) having three units or components or elements | Synonyms: ternary, treble, triple |
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