| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| second class | |
| —n | |
| 1. | the class or grade next in value, quality, etc, to the first |
| —adj | |
| 2. | of the class or grade next to the best in quality, etc |
| 3. | shoddy or inferior |
| 4. | of or denoting the class of accommodation in a hotel or on a train, etc, lower in quality and price than first class |
| 5. | a. (in Britain) of or relating to mail that is processed more slowly than first-class mail |
| b. (in the US and Canada) of or relating to mail that consists mainly of newspapers, etc | |
| 6. | education See second |
| —adv | |
| 7. | by second-class mail, transport, etc |