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coseismal

or co·seis·mic

[koh-sahyz-muh l, -sahys-]
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adjective
  1. of, relating to, or being in a line, curve, etc., connecting or comprising points on the earth's surface at which an earthquake wave arrives simultaneously.
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Origin of coseismal

First recorded in 1850–55; co- + seismal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for coseismic

coseismal

coseismic

adjective
  1. of or designating points at which earthquake waves are felt at the same time
  2. (of a line on a map) connecting such points
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noun
  1. such a line on a map
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012