unless
//ənˈlɛs//
Definitions
1.Except on a specified condition; if not.
- I’m leaving unless I get a pay rise.
- You can't go out unless it stops raining.
- Unless part of the staff, you are not allowed beyond this point.
2.If not; used with counterfactual conditionals.
- Unless He were omnipotent, we could not be sure of His ability to bless us.
- Who would know of Alexander or Caesar, or would respect the Stoics or the Peripatetics, unless they had been distinguished by the memorials of writers?
3.Except if; used with hypothetical conditionals.
- Q. If Lieutenant P. had given the word "Fire," would you have fired, and at what?, A. I should not have known, unless he had told me what to fire at.
- Lie down and finish out the night, since you are here; but, for heaven's sake! don't repeat that horrid noise: nothing could excuse it, unless you were having your throat cut!
Frequency
Overall
Common· #1103
By learning goal
- Everyday conversation
- Uncommon
- General reading & writing
- Common
- Academic
- Rare
- Literature
- Rare
Related words
Word family
Etymology
From Middle English unlesse, earlier on lesse (modern on + less), from (not) on lesse (than) (“(not) on a less compelling condition (than)”).
The quality of negation in the word and the lack of stress changed on to un-.