HOME > WordMaster® > VALID | 有効な

2011.10.11  (Review of 2008.02.04 edition)

Welcome back!

Like Shakespeare's Macbeth or the haiku of Matsuo Basho, some writing is eternal. But, alas, most documents we come across in business are much shorter-lived. In fact, the day of their demise is often known well in advance. This week we look at a collection of words that trace the life, death, and rebirth of documents used in business and business travel!

Today's Lesson
VALID   有効な


  • Something - for example, a passport, contract, or other document - is valid if it was made in an acceptable way (especially legally) and can still be used.

    Something is invalid if it is NOT valid.
  • valid とは、パスポートや契約などの文書が、(特に法律上)承認された方法で作成され、まだ使用できる状態である、つまり、有効な、という意味です。

    invalid とは、有効ではない、つまり、無効な、という意味です。



  1. You must have a valid work permit to apply for this position.
  2. Our business license is valid until the end of the year.
  3. (information in the fine print of a travel itinerary)
    It is the customer's responsibility to ensure that his or her passport is still valid before traveling.
  4. (station employee to passenger)
    I'm sorry, but this ticket is no longer valid. See here, it says that it must be used before October 1st.
  5. For added security, if someone types in an invalid password three times, the account will be automatically locked.

英会話レッスンParting is such sweet sorrow!