binding
adjective uk/ˈbaɪn.dɪŋ/ us/ˈbaɪn.dɪŋ/
（尤指协议）必须遵守的，有约束力的
(especially of an agreement) that cannot be legally avoided or stopped
a binding agreement 必须遵守的协定
The contract wasn't legally binding. 这份合同在法律上没有约束力。
binding
noun uk/ˈbaɪn.dɪŋ/ us/ˈbaɪn.dɪŋ/
(MATERIAL/FASTENING)
[ C or U ]（书籍的）封皮
the type of cover that a book has
She took a book from the shelf, admiring the gold edges to the pages and the green leather binding.
[ U ]镶边，滚边
a thin strip of material that can be sewn along the edges of clothes or other objects
The jacket is beautifully finished, and binding on the seams and pockets adds strength.