noun · Physical distance from front to rear, especially within a territory or spatial area.

部队向敌方领土纵深推进。

noun · The degree of progress, development, or strategic deployment in a metaphorical sense.

两国的经济合作正在向纵深发展。

noun · The extent or duration of a period of time.

这部作品展示了宏大的历史纵深。