strength exerted on behalf of someone or against opposition: the power to prevail and protect, overwhelmingly God's
This is the Bible's word for strength understood as power that engages, the force one brings to bear against an enemy or wields to help another. It is not simply the strength a body happens to have on hand; it is strength as it confronts opposition or shelters the weak. That is why the poets reserve it above all for God: it names the might by which he fights for his people, the strength he gives his king, and the power his worshipers ascribe back to him.
Because this kind of strength is what keeps a person safe, the word reaches naturally toward the idea of a refuge. When a psalm calls the LORD someone's strength, it often means he is the strong place they run to, set beside words for shelter, fortress, and high tower. And because raw power, displayed, is also glorious, the word keeps company with terms for splendor and majesty, so that strength here can shade into the dignity that strength commands.
A few harder uses turn the same idea against proud humans: the boastful might of a nation or temple that is about to be shattered, or strength worn as defiant boldness. These are not a separate word but the dark side of one idea, power as it is exerted, now severed from its true source and so set up for judgment. The whole range holds together because in Israel's theology having power and being a safe place are finally the same claim about God.