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a wave vibrating in the direction of propagation.

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the throwing back by a body or surface of light, heat, or sound without absorbing it.

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the process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the wave forms produced.

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an agency or means of doing something.

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A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium.

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an instance of vibrating.

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moving in one side and out of the other side of (an opening, channel, or location).

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a comb or tuft of feathers, fur, or skin on the head of a bird or other animal.