I realize that most of us will have an appreciation for the importance of seeing virtue first as a reverence for God...still it is worth clearly stating at the onset of this discussion.
It means Morally excellent
We may remember that Benjamin Franklin famously (and publicly) set out to achieve moral perfection in his own character. When someone pointed out to him that humility was not on his impressive list of self-prescribed virtues, he resolved to ammend his list, and his behavior, by "imitating Jesus and Plato."
Precisely how one can simply decide to practice humility without actually possessing humility was never answered by America's enlightened first statemen.
The point here is that claiming moral excellence outside of Christ is hardly virtuous in God's eyes, since such ambition is rooted in the rankest self-righteousness man is capable of. In victorian and modern times, we have seen how Christian humanists have fossilized their once spirit-filled churches simply by striving to have good virtuous character while having ...no fear of God before their eyes." Romans 3:18.
So, for us, Godly virtue is not something born from a motivation to have morally perfect character but born of a holy love to be pleasing and reverent to God.
"Let us purify ourselves from everything that contaminates body and spirit, perfecting holiness out of reverence for God." 2 Corinthians 7:1 :-)
Blessings!
MC