1. (a.) Of or pertaining to a period or periods, or to division by periods.

2. (a.) Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun.

3. (a.) Happening, by revolution, at a stated time; returning regularly, after a certain period of time; acting, happening, or appearing, at fixed intervals; recurring; as, periodical epidemics.

4. (a.) of or pertaining to a period; constituting a complete sentence.

5. (n.) A magazine or other publication which appears at stated or regular intervals.

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