Etymology
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flagship (n.)

also flag-ship, 1670s, a warship bearing the flag of an admiral, vice-admiral, or rear-admiral, from flag (n.) + ship (n.). Properly, at sea, a flag is the banner by which an admiral is distinguished from the other ships in his squadron, other banners being ensigns, pendants, standards, etc. Figurative use by 1933.

updated on December 05, 2014

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Definitions of flagship from WordNet

flagship (n.)
the chief one of a related group;
it is their flagship newspaper
flagship (n.)
the ship that carries the commander of a fleet and flies his flag;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.