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Period (Geology one of the largest)

in geology, one of the largest divisions of geological time. In this sense there are at least three periods, the Primary, the Secondary, and the Tertiary periods, to which a fourth or Quaternary one is sometimes added; also subdivisions; as, the Glacial period.

In mathematics, a number of figures considered together; one of two or more sets of figures or terms marked off by points or commas placed regularly after a certain number, as in numeration, in circulating decimals, or in the extraction of roots. In music, two or more phrases ending with a perfect cadence. In pathology, an interval more or less fixed in point of time at which the paroxysms of a fever, etc., recur. In printing, the full sto stop (.) which marks the end of a sentence in punctuating, or indicates an abbreviation, as Mr., Mr., Jan., B. C., etc. In rhetoric, a complete sentence from one full stop to another; a sentence so constructed as to have all its parts mutually dependent.