After months of debate, the committee finally reached a conclusion on the new policy.

conclusion 是名词，来自动词 conclude（结束、得出结论）。con- 是前缀表示"共同、一起"，-clude 来自拉丁词根 claudere 意为"关闭"。合起来表示"共同关闭讨论"，即"结论、决定"。