the central part of a country, historically, commonly known as the capital city or the main region, where an emperor or other ruler resides / something within a country

(historical or contemporary) any of several kingdoms, empires, or states of the Chinese people

a surname

a target, a mark, a bullseye / an objective, an object (of doing something)

as far as ... is concerned; in terms of ...

impossible to understand, utterly confused

deep learning

learning disability

(computing) machine learning

a cram school