Dictionary

1unless

conjunction un·less \ən-ˈles, ˈən-ˌ\

—used to say what will happen, be done, or be true if something else does not happen, is not done, or is not true

Full Definition of UNLESS

1
:  except on the condition that :  under any other circumstance than
2
:  without the accompanying circumstance or condition that :  but that :  but

Origin of UNLESS

Middle English unlesse, alteration of onlesse, from on + lesse less
First Known Use: 14th century

2unless

preposition

Definition of UNLESS

:  except possibly :  except

First Known Use of UNLESS

circa 1532

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