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| the acceleration of a falling body in the earth's gravitational field, inversely proportional to the square of the distance from the body to the center of the earth |
| a wave in which the direction of displacement is perpendicular to the direction of propagation, as a surface wave of water |
| electromagnetic wave | |
| —n | |
| See also electromagnetic radiation a wave of energy propagated in an electromagnetic field | |
| electromagnetic wave
A wave of energy consisting of electric and magnetic fields, oscillating at right angles to each other. See more at electromagnetic radiation. |