# Wave vector

From AMS Glossary

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## wave vector

The vector

**k**in the solution of a wave equation expressed as the product of a time- varying function and*A*exp(*i***k**·**x**), where**x**is the position vector and*A*is constant in space and time.The wave vector may, in general, be complex, and its real and imaginary parts need not be parallel, in which instance the wave is inhomogeneous.