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What do a.m. and p.m. stand for?

periodic system

[peer-ee-od-ik, peer-] /ˈpɪər iˈɒd ɪk, ˌpɪər-/
noun, Chemistry
1.
a system of classification of the elements based on the periodic law.
Origin of periodic system
1870-1875
1870-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for periodic system

periodic system

/ˌpɪərɪˈɒdɪk/
noun
1.
the classification of the elements based on the periodic law
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
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13
15
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