A very bright light that is dazzling.
The brilliancy of the diamonds made them hard to look at.
ダイヤモンドのきらめきはそれらを見るのを困難にさせた。
Being very smart or quick-thinking.
His brilliancy in math helped him solve the tough problems.
彼の数学の才能は彼に難しい問題を解決するのに役立ちました。
Being very good or successful at something.
Her brilliancy in ballet was praised by everyone.
彼女のバレエでの才能は皆に称賛されました。