perpetual motion machine; perpetual motion engine; perpetuum mobile
marrying to become a housewife; (lit.) permanent employment (once one becomes a housewife)
permanence; forever unchanging
permanent preservation; permanent repository; keeping something permanently; preservation in perpetuity
permanent edition; timeless edition; collector's version; only issue of non-regularly printed magazine or mook
removing hair permanently
permanent storage (radioactives, data, etc.)
permanent voter registration list
permanent disqualification; lifetime disqualification