Main Entry: 1se·quen·tial Pronunciation: si-'kwen-ch&l Function: adjective 1: occurring as a sequela of disease orinjury 2: of, relating to, forming, or taken in a sequence <sequential pills for contraception>
Main Entry: 2sequential Function: noun : a birth control pill of which those taken during approximately the first three weeks contain only estrogen and thosetaken during the rest of the cycle contain both estrogen and progestogen