noun
governor of Tokyo; metropolitan governor
Specifically refers to the governor of the Tokyo Metropolis (東京都). Not used for governors of other prefectures.
都知事は明日、記者会見を開く予定だ。
The governor of Tokyo is scheduled to hold a press conference tomorrow.
新しい都知事が選挙で選ばれた。
A new governor of Tokyo was elected.
府知事 refers to the governor of Osaka or Kyoto Prefecture (府). 都知事 is only for Tokyo.
Compound of 都 (to, 'metropolis', referring to Tokyo) and 知事 (chiji, 'governor').