n.c.1600, from Latin decessionem, noun of action from past participle stem of decedere "to go down, depart" (see decease (n.)). if (window.googletag) {googletag.cmd.push(function() { googletag.display('dcomMobileSERPDisplayTopAd-300x250'); });} else {console.error('googletag not defined, dcomMobileSERPDisplayTopAd-300x250');}