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• a  happening or recurring at regular intervals
  the periodic appearance of the seventeen-year locust
• s  recurring or reappearing from time to time
  periodic feelings of anxiety

• Any number of old-school assignments--memorizing the battles of the Civil War or the periodic table of the elements--now seem faintly absurd.
• The blog also features periodic "Give That Photo a Name" contests, with the winners receiving real prizes.
• A nation that had been wallowing in one of its periodic bouts of angst is now so transformed that the newspaper Der Spiegel recently ran a cover calling Germany the "Land of Smiles.

• periodical
• occasional

• aperiodic

News & Articles

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• Lime Energy Co. Announces Revised Filing Schedule
  HUNTERSVILLE, N.C. -- via PRWEB - Lime Energy Co. (the "Company") today announced a revised schedule for filing its delinquent periodic reports and its restatement of the years ended December ...
  June 27, 2013 - GlobeNewswire via Yahoo! Finance
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  June 26, 2013 - Cato Institute
• 9 Beautiful Desktop Backgrounds Designed to Make You Smarter
  Anyone can throw an image of the periodic table onto a desktop and call it a background, but the creations in the gallery above combine useful information with strong aesthetic appeal. SEE ALSO: 10 Creative Solutions for a More Productive Workspace What's your favorite site to find desktop backgrounds? Let us know in the comments below Mashable composite; image courtesy of Simple Desktops, Jack ...
  June 26, 2013 - Mashable

Quotes

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• Barack Obama in Washington Post
  Obama said any system of detention "must have a thorough process of periodic review, so that any prolonged detention is carefully evaluated and justified."
• Peter Costello in Asia Corporate News Network (press release)
  Federal Treasurer, Peter Costello said yesterday: "Well I can tell you that Australia's financial institutions are very, very secure. We stress test them through APRA on a periodic basis and they are very secure. And I think anybody who knows...
• Tony Blair in Reuters.uk
  In politics at the top you get used to the periodic storms and I don't for a moment, incidentally, underestimate the volume of this one,Blair said in a speech, which made no direct reference to the cash-for-peerages investigation.