Translation guide
How to express 'one copy' in Japanese, depending on what is being counted.
The learner wants to say 'one copy' when referring to a single physical instance of a book, magazine, report, or similar item.
The standard counter for copies of books, magazines, newspapers, documents, and other printed or duplicated materials. Use this in most situations.
Please give me one copy of this report.
Please distribute one copy of the materials to each person.
Used specifically for one copy of a book or bound volume. More natural than 一部 when emphasizing the book as a physical object.
I bought one copy of this book.
Used for one copy of a letter or document that is sent or delivered. Less common in everyday speech.
Please send one copy of the invoice.
The learner wants to refer to a single instance of a digital file, such as a software copy, music file, or backup.
Also used for digital copies, especially when referring to licensed software, e-books, or official documents. It implies a countable unit.
I purchased one copy of the software.
A generic counter that can be used for digital files in casual contexts. Less formal than 一部.
A loanword from English, used in technical or IT contexts. Not as natural as 一部 in general conversation.
Please keep one copy of the backup.
The learner wants to say 'one copy' when referring to a duplicate of a physical item like a key.
一部 is the most versatile for 'one copy' of printed or duplicated materials. 一冊 is specifically for bound books. 一通 is for letters or documents sent through mail or delivery. Use 一部 when unsure.
Please give me one copy of the pamphlet.
I borrowed one copy of this novel.
I received one copy of the invitation letter.
そのファイルを一つコピーしてください。
Please make one copy of that file.
I made one more copy of the key.