happening again and again after regular times

at regular times; again and again after some time

set amount of time during which events take place

A period during which a new employee is monitored to assess his/her capability.

A relatively brief period when a new leader is given greater leeway with respect to changes he or she wishes to make.

plural of period piece

plural of xerothermic period

(epidemiology) The time elapsed between an exposure to a pathogenic organism, a chemical or radiation, and the appearance of signs and symptoms.

An event of a woman's discharging of menstrual flow of blood and cells.

(politics, government) In Canadian federal and provincial parliaments, a period of regularly scheduled time in the lower chamber during which members of the official opposition party and other members may direct questions to the prime minister and to cabinet ministers concerning affairs of state.