プログレッシブ和英中辞典(第4版)の解説
かつて【×曾て・×嘗て】
once; at one time; formerly; before；〔否定文で〕never；〔疑問文・最上級のあとで〕ever
かつて権力を振るっていた一族
a formerly [once] influential clan
かつての校長［学長］
the ex-principal [former president]
かつての恋人
his 「onetime girlfriend [ex-girlfriend]
彼女はかつて女優だった
She was once [formerly] an actress.
かつてはここにわらぶきの家があった
There used to be a house with a thatched roof here.
そんなことはかつて聞いたことがない
I have never heard of such a thing.
かつてない寒い日だ
This is the coldest day we have ever had.／We've never had such a cold day.