| any of several physical laws that the resultant of similar vector quantities at a point is a function of the sum of the individual quantities, esp. the law that the displacement at a point in a medium undergoing simple harmonic motion is equal to the sum of the displacements of each individual wave. |
| superposition principle n. A principle holding that two or more solutions to a linear equation or set of linear equations can be added together so that their sum is also a solution. |