- unless
- un|lessW1S1 [ʌnˈles, ən-] conj[Date: 1400-1500; Origin: on less than 'on a lower condition than' (1400-1500)]1.) used to say that something will happen or be true if something else does not happen or is not true▪ Unless some extra money is found, the theatre will close.▪ I think you should complain - unless, of course, you are happy with the way things are.▪ He won't go to sleep unless you tell him a story.▪ I can't leave her unless I know she's all right.see usage note ↑except12.) not unlessonly if▪ 'Will you go with her?' 'Not unless she wants me to.'▬▬▬▬▬▬▬WORD CHOICE: unless, if ... not, in case, or (else)Use unless to say that something will happen or be true if something else does not happen or is not true : Unless they get protection, they will not testify.!! Do not use the future tense after unless : I won't go unless you go (NOT unless you will go).!! Do not say 'unless if' : Don't call him unless it's urgent (NOT unless if it's urgent).Use if ... not when you know that something did not or will not happen : If he had not tripped, he would have won (=but he didn't win). |: I would go out if it wasn't raining (=but it is raining, so I am not going out).Use in case when talking about something that is or should be done because something might happen : Take a sweater in case you get cold (NOT unless you get cold).Use or or or else to say what bad thing will definitely happen if something else does not happen : You'd better go, or else you'll miss the train (NOT unless you miss the train).▬▬▬▬▬▬▬
Dictionary of contemporary English. 2013.