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一旦 una vez; en caso de que
Stroke order
一旦 is written in 6 strokes across 2 characters.

- 一 — 1 stroke
- 旦 — 5 strokes
Senses
- in case (sth happens)
- if
- once (sth happens, then...)
- when
- in a short time
- in one day
Related words
一旦 is pronounced yídàn and means “una vez; en caso de que”. You will meet it in HSK 5, a band of the Hanyu Shuiping Kaoshi — the standard test of Chinese proficiency. Most learners can pick 一旦 out of a list long before they can reach for it unprompted, and the gap between those two closes only with repeated recall. LexiTrail schedules the next sighting from how well you did on the last.