1. 1 〔一つ一つ〕one by one
    • それをいちいち数え上げたらきりがない
    • If you start counting them one by one, there will be no end to it.
  1. 2 〔ことごとく〕
    • いちいち文句を言うな
    • Don't find fault with everything.
  1. 3 〔詳しく〕in detail
    • いちいち説明しなくてよい
    • You needn't 「explain in detail [go into detail].