seis‧mic /ˈsaɪzmɪk/
adjective [only before noun][
Date: 1800-1900;
Language: Greek;
Origin: seismos 'shock, earthquake', from seiein 'to shake']
1. technical relating to or caused by
earthquakes:
increased seismic activity2. very great, serious, or important:
seismic changes in international relations [TahlilGaran] Dictionary of Contemporary English ▲