Longman Dictionary of Contemporary English homepage

Topic: GEOLOGY

Date: 1800-1900
Language: Greek
Origin: seismos 'shock, earthquake', from seiein 'to shake'

seismic

adjective
     
seis‧mic [only before noun]
1 technicalHEG relating to or caused by earthquakes:
increased seismic activity
2 very great, serious, or important:
seismic changes in international relations
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