(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.

(astronomy) Taking over 200 years to complete an orbit; especially said of comets.

a school period in which a student has free time, i.e., is not enrolled in a class.

(physics) Half of the period of a wave etc; typically the time taken for part of a wave to be replaced by a similar part that is out of phase.

plural of periodic comet

Time period between the receipt of the letter of dismissal and the last working day.

plural of accounting period

A regular period of time, as a month, quarter, or year, for which an operative statement is drawn up.

plural of zero period