binding
n
1 [C] strong covering holding the pages of a book together （书的）封皮.
2 [U] fabric used for binding edges, eg braid 绲边; 绲条; 滚边. adj ~ (on/upon sb) imposing a legal obligation (on sb) 对（某人）有法律约束力的
The agreement is binding on both parties. 协议对双方具有约束力.