complex number
  • noun a number written as a + ib, where i is the square root of minus one
  • A number in the form of a + bi, in which a and b are real numbers, and i is the square root of -1. That is, i2 = -1. In electronics, the symbol utilized to express the square root of -1 is usually j. When a = 0, the resulting expression is an imaginary number.

Not what you were looking for?