period Antonyms

kickoff start continuation beginning intensity prolonging prolongation propagation protraction second staunchness stretching persistency persistence perpetuity jiffy lengthening lot moment onset opening origin outset permanency perpetuation succession sustainment split second collectivity carrying-on ceaselessness oversimplification first phase absence of menstrual discharge absence of menstrual periods absence of menstruation absent menstruation heartbeat amenorrhea sustention trice twinkling viability widening wink changelessness carry-over works agelessness continued existence