flagship

UK: /ˈflægʃɪp/ US: /ˈflægˌʃɪp/ ,(flag′ship′)

WordReference Random House Learner's Dictionary of American English © 2025

flag•ship /ˈflægˌʃɪp/   n. [countable]

1. Nautical, Naval Terms a ship carrying the commander of a fleet, squadron, or the like.
2. the best or most important one of a group or system:
   The largest store is the flagship of the chain.

WordReference Random House Unabridged Dictionary of American English © 2025

flag•ship  (flag′ship′), n. 

1. Nautical, Naval Terms a ship carrying the flag officer or the commander of a fleet, squadron, or the like, and displaying the officer's flag.
2. Nautical, Naval Terms the main vessel of a shipping line.
3. Nautical, Naval Terms 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.

adj. 

5. Naval Terms being or constituting a flagship.

• flag¹ + ship 1665–75

Collins Concise English Dictionary © HarperCollins Publishers::

flagship / ˈflæɡˌʃɪp/ noun

1. a ship, esp in a fleet, aboard which the commander of the fleet is quartered
2. the most important ship belonging to a shipping company
3. a single item from a related group considered as the most important, often in establishing a public image: the evening news is the flagship of many broadcasters