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

periodic system

[peer-ee-od-ik, peer-] /ˈpɪər iˈɒd ɪk, ˌpɪər-/
noun, Chemistry
a system of classification of the elements based on the periodic law.
Origin of periodic system
1870-75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for periodic system
  • Performs routine maintenance and periodic system upgrades.
  • The purpose of this article is to propose a new design for the presentation of the periodic system of the elements.
  • periodic system reviews are critical to ensure management, technical, and operational controls are functioning effectively.
  • Perform periodic system backups and network configuration management.
  • Maintenance personnel can also use these recordings for periodic system evaluation.
British Dictionary definitions for periodic system

periodic system

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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