Synonym of time period

(communism, history) According to an obsolete theory, a period shortly after the Great Depression in which capitalism would be marked by further crises and then soon collapse.

A subdivision of the Devonian system of America

(historical) The period of Egyptian history from the end of the Third Intermediate Period to the conquest of Egypt by Alexander the Great (the 26th through 31st dynasties), characterized by alternating periods of native and Persian rule.

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) A disturbance in the motion of a planet due to its position in its orbit relative to another planet.

plural of periodic inequality

(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.