JMdict entry #1316210

1. noun (common) (futsuumeishi) law prescription; statute of limitations; limitation period
2. noun (common) (futsuumeishi) lapsing with time (e.g. of an obligation); no longer standing (e.g. of a promise); becoming void (e.g. of a contract); becoming bygones (e.g. of a mishap)
3. noun (common) (futsuumeishi) chemistry ageing; aging
   see: 時効硬化