Englishfor English speakers
elastic
Adjective
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Something is elastic if it can stretch or bend and go back to the way it was.
She held the papers together by putting an elastic (rubber) band around them.
A metal spring is elastic: it gives back the energy that was put into it when it was pushed.
amplitude
Noun
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The measure of how big something is.
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The biggest possible absolute value of the vertical part of a periodic curve.
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The biggest possible absolute value of something that changes periodically (like a wave).