1 [more outstanding; most outstanding] : extremely good or excellent
Tonight we will honor the school's most outstanding students/teachers/athletes/performers.
You did an outstanding job on the project.
the outstanding quality of your work
2 [more outstanding; most outstanding] : easy to notice especially because of being important or very good
There are some outstanding [=conspicuous] exceptions to this rule.
Outstanding among the menu items were the tomato soup and the swordfish.
3 : not yet paid
outstanding [=unpaid] bills
She had several outstanding parking tickets in her car.
He left a balance of 50 dollars outstanding on his account.