| OP | opera with a happy ending and in which some of the text is spoken |
|---|---|
| OP | a company that produces operas |
| OP | an optical instrument designed for simultaneous use by both eyes |
| OP | a man's hat with a tall crown |
| OP | a large cloak worn over evening clothes |
| OP | theater where opera is performed |
| OP | singer of lead role in an opera |
| OP | capable of being treated by surgical operation |
| OP | usable for a specific purpose |
| OP | fit or ready for use or service |
| OP | a patron of the opera |
| OP | a quantity upon which a mathematical operation is performed |