stratification
strat.i.fi.ca.tion \.strat-*-f*-'ka--sh*n\ n : the act or process of stratifying or state of being stratified : a str atified formation
strat.i.fi.ca.tion \.strat-*-f*-'ka--sh*n\ n : the act or process of stratifying or state of being stratified : a str atified formation