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seismism

[ sahyz-miz-uhm, sahys- ]
/ ˈsaɪz mɪz əm, ˈsaɪs- /
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noun

the natural activity or group of phenomena associated with earthquakes.

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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Origin of seismism

First recorded in 1900–05; seism + -ism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
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