How is 一旦 pronounced?

一旦 is pronounced “yī dàn” in pinyin.

What HSK level is 一旦?

一旦 belongs to HSK 5 in the HSK 3.0 vocabulary.

HSK 5adverbconjunction

一旦

yī dàn

一旦 (yī dàn) means “in case (sth happens); if; once (sth happens, then...); when; in a short time; in one day”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.

How to write 一旦

Practice each character:

一

Example

一旦下雨，比赛就取消。

Yídàn xiàyǔ, bǐsài jiu qǔxiāo.

Once it rains, the match is cancelled.

More HSK 5 vocabulary

HSK 5 →

哎āihey!; (interjection used to attract attention or to express surprise or disapprobation)唉āiinterjection or grunt of agreement or recognition (e.g. yes, it's me!); to sigh 爱护ài hùto cherish; to treasure; to take care of; to love and protect 爱惜ài xīto cherish; to treasure; to use sparingly 爱心ài xīncompassion; kindness; care for others; love; charity (bazaar, golf day etc); heart (the symbol ♥)安慰ān wèito comfort; to console 安装ān zhuāngto install; to erect; to fix; to mount; installation 岸ànvariant of 岸暗ànvariant of 暗熬夜áo yèto stay up late or all night 把握bǎ wòto grasp (also fig.); to seize; to hold; assurance; certainty; sure (of the outcome)摆bǎito arrange; to exhibit; to move to and fro; a pendulum

Frequently asked questions

What does 一旦 mean?: 一旦 (yī dàn) means “in case (sth happens); if; once (sth happens, then...); when; in a short time; in one day”. It is an HSK 5 word.
How is 一旦 pronounced?: 一旦 is pronounced “yī dàn” in pinyin.
What HSK level is 一旦?: 一旦 belongs to HSK 5 in the HSK 3.0 vocabulary.

Updated: 2026-05-27