n. 25B6; noun
a six-week period : TIME, spell, interval, stretch, term, span, phase, bout, run, duration, chapter, stage; while; Brit. informal patch.
the post-war period : ERA, age, epoch, time, days, years; Geology aeon. See list at age .
a double maths period : LESSON, class, session.
women who suffer from painful periods : MENSTRUATION, menstrual flow; informal the curse, monthlies, time of the month; technical menses.
(N. Amer.) a comma instead of a period : FULL STOP, full point, point, stop.