一斤

1. Origins, structure, and basic meaning

• Structure: The written form is 一斤, read いっきん. This expression counts one loaf of bread and can also denote a traditional weight unit of about six hundred grams.
• Basic usage: 食パンを一斤買う counts one loaf of sandwich bread, while 一斤は六百グラム identifies one unit in an older weight system.

2. Common pitfalls and similar expressions

• One loaf for breakfast
  • One loaf of sandwich bread is bought for breakfast. Example: 朝食用に食パンを一斤買った。 — I bought one loaf of sandwich bread for breakfast.
• A traditional weight conversion
  • The traditional unit is described as approximately six hundred grams. Example: 昔の重さの単位では一斤がおよそ六百グラムに当たる。 — In an old system of weight, one unit was about six hundred grams.