American Heritage Dictionary
(6)
Century Dictionary
(18)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
Blogging thrives on the periodic, the recurring, the ongoing, and Morrison has supplied a steady stream of material for as long as there has been a comics blogosphere.— I Am NOT the Beastmaster
This transformation of law and politics is also bound up with a capitalist dynamic which can be described as a periodic interplay between a functionally driven opening followed in each instance by a socially integrative closure at a higher level.— signandsight.com
Commissioner Thomas Mazzucco called the periodic briefings for the mayor a "great business decision."— SFGate: Top News Stories
This observation leads the authors to conclude that the source is not truly periodic, but it exhibits quasi-periodic features similar to those observed in Galactic black holes.— ESA Science & Technology
Readers of OttawaWatch will recall my periodic references to Smith and his close family ties to the Canadian evangelical community.— Canadian Christianity - Canadian News

Century Dictionary (2)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a week.
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