1. periodical - Noun
2. periodical - Adjective
Of or pertaining to a period or periods, or to division by periods.
Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun.
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.
Of or pertaining to a period; constituting a complete sentence.
A magazine or other publication which appears at stated or regular intervals.
Source: Webster's dictionaryThe power of the periodical press is second only to that of the people. Alexis de Tocqueville
The use of criticism, in periodical writing, is to sift, not to stamp a work. Margaret Fuller
We know no spectacle so ridiculous as the British public in one of its periodical fits of morality. Thomas Babington Macaulay
If we glance at the most important revolutions in history, we are at no loss to perceive that the greatest number of these originated in the periodical revolutions of the human mind. Wilhelm von Humboldt
Your system was liable to periodical convulsions...business crises at intervals of five to ten years, which wrecked the industries of the nation. Edward Bellamy
A circuit performed by a capital and meant to be a periodical process, not an individual act, is called its turnover. The duration of this turnover is determined by the sum of its time of production and its time of circulation. Karl Marx