wave function

noun Physics.
1.
a solution of a wave equation.
2.
(in quantum mechanics) a mathematical function, found by solving a quantum-mechanical wave equation, that is used to predict the outcome of measurements on physical systems.
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World English Dictionary
wave function
 
n
physics ψ a mathematical function of position and generally time, used in wave mechanics to describe the state of a physical system

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
wave function  
A mathematical function used in quantum mechanics to describe the propagation of the wave associated with a particle or group of particles. The wave function is a solution to Schrödinger's equation, given the boundary conditions that describe the physical system in which the particle is found. The square of the absolute value of the function evaluated at a given point in space is proportional to the probability of finding the particle in the immediate vicinity of that position.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Teleportation is a protocol about how to send a quantum state-a wave
  function-from one place to another.
The quantum conjugate of the wave function is essential to experiment but
  without logical foundation apart from vague conjecture.
When the wave function finally collapses, it's never in your favor.
Now suppose you start with a universe specified by some wave function that
  completely specifies it.
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