1.  laxation(n = noun.process) defecation, shitting - the elimination of fecal waste through the anus;
is a kind of elimination, evacuation, excreting, excretion, voiding
has particulars: bm, bowel movement, movement, haematochezia, hematochezia, dump, shit, urochesia, urochezia

2.  laxation(n = noun.act) loosening - the act of making something less tight;
is a kind of adjustment, alteration, modification
has particulars: undoing, unfastening, untying

   The act of loosening or slackening, or the state of being loosened or slackened. [1913 Webster]