seismic
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Learner's definition of SEISMIC
always used before a noun
1
technical
:
of, relating to, or caused by an earthquake
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seismic activity/data/waves/zones
2
[more seismic; most seismic]
:
very great or important
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Seismic social changes have occurred.
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The discovery caused a seismic shift [=a great change] in public attitudes.
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a seismically active region [=a region where many earthquakes occur]
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