virtue

3. N-COUNT.

The virtue of something is an advantage or benefit that it has, especially in comparison with something else.

• There was no virtue in returning to Calvi the way I had come.
  

... Cobuild

3. A particularly efficacious, good, or beneficial quality; advantage: 

• a plan with the virtue of being practical.
  

... Am-Heritage

(cf: in Cobuild) 

1. N-UNCOUNT

Virtue is thinking and doing what is right and avoiding what is wrong.

• She could have established her own innocence and virtue easily enough.     
• = goodness,  ≠ vice   

2. N-COUNT

A virtue is a good quality or way of behaving.

• His virtue is patience.     
• Humility is considered a virtue.