| OP | incomprehensibility resulting from obscurity of meaning |
|---|---|
| OP | an organization of countries formed in 1961 to agree on a common policy for the sale of petroleum |
| OP | German industrialist who was the first in Germany to use an assembly line in manufacturing automobiles (1871-1948) |
| OP | information that has become public |
| OP | a tournament in which both professionals and amateurs may play |
| OP | where the air is unconfined |
| OP | a clear or unobstructed space or expanse of land or water |
| OP | make available, as of an opportunity |
| OP | become available |
| OP | make the opening move, in chess |
| OP | cause to open or to become open |
| OP | become open |