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periodical
Periodical describes something that occurs at fixed or regular intervals. (adjective)
When you visit your doctor every two months, this is an example of a situation where you makeperiodical visits to your doctor.
Aperiodical is a magazine or newspaper that comes out at fixed or regular intervals. (noun)
A weekly newspaper is an example of aperiodical.
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See periodical in Webster's New World College Dictionary
See periodical in American Heritage Dictionary 4
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