complex conjugate

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Either one of a pair of complex numbers whose real parts are identical and whose imaginary parts differ only in sign; for example, 6 + 4i and 6 − 4i are complex conjugates.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun mathematics Of a complex number x, the complex number formed by changing the sign of the imaginary part: The complex conjugate of a + bi is a - bi.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun either of two complex numbers whose real parts are identical and whose imaginary parts differ only in sign