The word Ne•tzach is an abstract noun, and it has exactly the same meaning in biblical and modern Hebrew. It means “eternity” and is used as a time description for an everlasting time span. The second word, “nitz•chi,” means the same, but it is an adjective and must be connected to a noun. It is used only in modern Hebrew.

In the Old Testament, the Hebrew word `olam is used for "eternity," sometimes in the sense of unlimited duration, sometimes in the sense of a cycle or an age, and sometimes, in later Hebrew, in the signification of world.