Definitions from Wiktionary (hub)

▸ noun:  The central part, usually cylindrical, of a wheel; the nave.
▸ noun:  A point where many routes meet and traffic is distributed, dispensed, or diverted.
▸ noun:  A central facility providing a range of related services, such as a medical hub or an educational hub.
▸ noun:  (networking) A computer networking device connecting several Ethernet ports. See switch.
▸ noun:  (surveying) A stake with a nail in it, used to mark a temporary point.
▸ noun:  A male weasel; a buck; a dog; a jack.
▸ noun:  (US) A rough protuberance or projecting obstruction.
▸ noun:  (video games) An area in a video game from which individual levels are accessed.
▸ noun:  A goal or mark at which quoits, etc., are thrown.
▸ noun:  A hardened, engraved steel punch for impressing a device upon a die, used in coining, etc.
▸ noun:  A screw hob.
▸ noun:  A block for scotching a wheel.
▸ noun:  (informal) Nickname for Boston, Massachusetts, United States.
▸ noun:  (Internet slang, euphemistic) Pornhub.
▸ noun:  Alternative letter-case form of Hub [(informal) Nickname for Boston, Massachusetts, United States.]

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