丁度

1. Origins, structure, and basic meaning

• Structure: 丁度 is read as ちょうど and is an adverb meaning exactly for an amount or time, or just then for a fitting moment.
• Basic usage: Taking exactly ten minutes appears in 丁度十分かかる, while something happening just then appears in 丁度その時.

2. Common pitfalls and similar expressions

• An exact amount and a fitting moment
  • Before a number it marks exactness without approximation, while before an event time it means at that very moment.
• Difference from 約
  • Unlike the word for an approximate amount, this term states that an amount or moment matches exactly.