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| the distance measured by the propagation of a wave between two successive points in the wave that are characterized by the same phase of oscillation |
| the analogous motion of the particles of a mass of air or the like, whose state of equilibrium has been disturbed, as in transmitting sound |
attraction at·trac·tion (ə-trāk'shən)
n.
A force acting mutually between particles of matter to draw them together and to resist their separation.