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periodic inequality
(astronomy) A disturbance in the motion of a planet due to its position in its orbit relative to another planet.
periodic inequalities
synodic period
(astronomy) The apparent orbital period of a planet as seen from Earth.
sidereal period
(astronomy) sidereal orbital period / (astronomy) sidereal rotation period
Migration Period
(history) The age of mass migration of Germanic people in Europe during the early Middle Ages, circa 376 to 800 AD.
periodic months
plural of periodic month
periodic month
Synonym of tropical month
period poverty
The state of a woman too poor to be able to afford sanitary products (tampons, sanitary towels and the like) connected to her period.
modern period
The period following postclassical history (in Europe known as the "Middle Ages"), spanning from about 1500 to the present.
period dramas
plural of period drama