| 1. | a ship carrying the flag officer or the commander of a fleet, squadron, or the like, and displaying the officer's flag. |
| 2. | the main vessel of a shipping line. |
| 3. | any of the best or largest ships or airplanes operated by a passenger line. |
| 4. | the best or most important one of a group or system: This store is the flagship of our retail chain. |
| 5. | being or constituting a flagship. |