Netsach is a multivalent word meaning perpetuity (forever/always), victory, eminence, or strength. Appearing over 40 times, it is used both temporally ('forever, to the end') and as a quality ('surpassing, preeminent'). In the Psalms it often appears as 'forever' — 'Will the Lord reject forever? Will he never show his favor again?' (Ps 77:7). It is also used for victory in battle and for the 'choirmaster' (menatseach — the preeminent one) in Psalm superscriptions.
The multivalence of netsach is theologically rich. When Samuel calls God 'the Netsach of Israel' — the Victory/Glory/Eternal One — he is speaking of God's unchangeable character as the ground for Israel's trust. God's 'forevernesss' is not merely temporal but qualitative: He is eminently, surpassingly, victoriously God. The choir director (menatseach) in the Psalms is the one who leads praise to the Eternal Victor.