USEFUL THING›something good about a situation that helps you: One of the advantages of living in town is having the shops so near.
SUCCESS›something that will help you to succeed: These new routes will give the airline a considerable advantage over its competitors.By half time we had a 2-0 advantage (= were winning by two points).If we could start early it would be to our advantage (= help us to succeed). → Oppositedisadvantage
take advantage of sth›to use the good things in a situation: I thought I'd take advantage of the sports facilities while I'm here.
take advantage of sb/sth›to treat someone badly in order to get what you want