一旦
How to Say
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How to Write
Meaning: Once
How to Understand
一旦
一旦 is an adverb meaning 'once' or 'as soon as,' used to indicate a condition or time when something will happen. It often introduces a hypothetical situation or a future event that depends on a specific condition being met.
The character 一 (yī) means 'one' or 'a single,' and 旦 (dàn) originally meant 'daylight' or 'day.' Together, they form a phrase that conveys the idea of 'once' or 'when a certain moment arrives,' similar to the English expression 'once...' or 'as soon as...'
一旦 is commonly used in conditional sentences, such as '一旦发生事故，立即通知警察' (Once an accident occurs, notify the police immediately). It is also used in formal and literary contexts, emphasizing the immediacy of a response or action following a particular event.
Example Sentences
一旦你开始学习中文，就会发现它很有趣。
Once you start learning Chinese, you'll find it very interesting.
一旦下雨，比赛将被取消。
Once it rains, the game will be canceled.