laxation laxation /lækˈseɪʃən/

noun

1. The act of making something less tight  ( laxation , loosening )
   the act of making something less tight
   
2. The elimination of fecal waste through the anus  ( defecation , laxation , shitting [Vulgar] , defaecation [British] )
   the elimination of fecal waste through the anus