Main Entry:

¹un·less

Pronunciation:

\ən-ˈles, ˈən-ˌ\

Function:

conjunction

Etymology:

Middle English unlesse, alteration of onlesse, from on + lesse less

Date:

14th century

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