Definitions
adv. on one occasion only
一次
adv. at a time in the past
曾经；从前
conj. as soon as something happens or becomes true
一旦；当……之后
Example
I water this little cactus once every two weeks.
我每两周给这株小仙人掌浇一次水。
Once reliable public transport becomes available, more commuters may choose to leave their cars at home.
一旦有了可靠的公共交通，更多通勤者可能会选择不开车出门。
Collocations
- once a week
- at once
- once again
- once in a while
Usage tip
once引导将来时间从句时，通常用一般现在时。
FAQ
- What does once mean?
- on one occasion only at a time in the past as soon as something happens or becomes true
- How is once pronounced?
- UK /wʌns/, US /wʌns/. Use the audio buttons above to listen.
