The length of time during which an activity occurs or a condition remains. It may be measured either in seconds or in millions of years, depending upon the nature of the activity of condition being considered.

(astronomy) The apparent orbital period of a planet as seen from Earth.

(astronomy) sidereal orbital period / (astronomy) sidereal rotation period

(history) The age of mass migration of Germanic people in Europe during the early Middle Ages, circa 376 to 800 AD.

plural of probationary period

The state of a woman too poor to be able to afford sanitary products (tampons, sanitary towels and the like) connected to her period.

The period following postclassical history (in Europe known as the "Middle Ages"), spanning from about 1500 to the present.

plural of period drama

Alternative form of menstrual period

Alternative form of Question Period