I've been invited to their wedding, but I haven't decided whether to accept.

accept 是动词，意思是"接受、同意"，表示对邀请或提议给予肯定的回应。这个词由前缀 ac-（表示"朝向"）和词根 cept（来自拉丁语 capere，意为"拿、取"）组成，字面意思是"拿过来"，引申为"接受"。