binding
n
1 [C] strong covering holding the pages of a book together (書的)封皮.
2 [U] fabric used for binding edges, eg braid 緄邊; 緄條; 滾邊. adj ~ (on/upon sb) imposing a legal obligation (on sb) 對(某人)有法律約束力的
The agreement is binding on both parties. 協議對雙方具有約束力.