What does strength mean?

It means power, such as the power in a person's muscles thus allowing the person to lift heavy weights. It can also refer to a military unit, the greater the size of the unit, the more strength it has. It can also refer to the strength of a substance, such as steel or iron. Strength can also refer to a person's belief; how sure they are about faith for example. Such as: "The strength of his conviction in god is great."