- the chronology of the earth, as based on both absolute and relative methods of age determination.
Origin of geochronology
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- the branch of geology concerned with ordering and dating of events in the earth's history, including the origin of the earth itself
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
Word Origin and History for geochronology
Online Etymology Dictionary, © 2010 Douglas Harper