1. I 〔光の強さ〕
    • 電灯の明るさ
    • the brightness of an electric bulb
    • あたりは次第に明るさを増した
    • It became lighter (and lighter) around us.
  1. II
  1. 1 〔朗らかさ〕
    • 彼女には昔ほどの明るさがなかった
    • She was not so cheerful as she used to be.
  1. 2 〔将来の期待〕
    • 未来には明るさがない
    • Our prospects are grim.