Noun

1. A score of one over par in golf.
2. One of two sets of wheels under a train car.
3. A piece of solid or semisolid mucus in or removed from the nostril.
4. A representative specimen, taken from the centre a spread of production - a sample with bogey (typical) characteristics.
5. a standard of performance set up as a mark to be aimed at in competition.
6. An unidentified aircraft, especially as observed as a spot on a radar screen, and often suspected to be hostile. (Also sometimes used as a synonym for bandit - an enemy aircraft)