- noun a range of variation of the strength or size of a signal or quantity such as the height of a wave, the magnitude of a variable star, or any other measured amount
- The total range of variation of a quantity like the height of a wave, the magnitude of a variable star, or any other measured amount. In astronomy, amplitude measurements are most often made of light curves, the graphs which show how the radiation received from stars and other astronomical objects varies with time.
- In a wave or other periodic phenomenon, the maximum absolute value of the displacement from a reference position, such as zero.
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