文庫

1. Origins, structure, and basic meaning

• Structure: 文庫, read ぶんこ, means a book collection or a small-format, portable edition.
• Basic usage: It can refer either to a book taken on a trip or to someone’s collection of books.

2. Common pitfalls and similar expressions

• An individual book and a collection
  • 文庫を一冊 refers to one small-format book; 祖父の文庫 refers to the grandfather’s collection. Reading the latter as just one small book narrows its meaning.