Definition of "periodicity" [pe•ri•o•dic•i•ty]

• The quality or state of being periodic; recurrence at regular intervals. (noun)
• The repetition of similar properties in chemical elements, as indicated by their positioning in the periodic table. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The Doppler shift periodicity is short and stronger."
• "4 There may be a longer term periodicity associated with troposheric temperatures, or 1998 marks the onset of a long period of warming."
• "Thomas Gradgrind, a man of facts and calculations, spoke as a representative of what modern philosophers would characterise, in the context of what is described as periodicity, as the modern age."