equiv·a·len·cy 
/ɪˈkwɪvələnsi/ noun
/ɪˈkwɪvələnsi/ noun [noncount] 1 : equivalence 2 chiefly US : a level of achievement that is considered to be on the same level as finishing a course of study — often used before another noun ▪ He went to night school and got his high school equivalency certificate. [=a certificate that is equivalent to a high school degree]
