The delimitation of the border between the two countries is expected to be completed next month.

delimitation 是由动词 delimit（划定界限）加上名词后缀 -ation 构成的名词。delimit 本身由前缀 de-（表示"完全、彻底"）和 limit（限制、界限）组成。delimitation 指"划定边界"这一行为或过程。