(mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1  
<noun.quantity> freq. cnt.: 3 freq. cnt.: 3
<noun.quantity> freq. cnt.: 3 freq. cnt.: 3
| complex number |   | 
| complex quantity |   | 
| imaginary |   | 
| imaginary number |   | 
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