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.

A periodical published in electronic format to be read on a computer or similar device.

plural of periodic comet

plural of periodical 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

plural of menstrual period