unless
conjunctionDefinition of unless
(Entry 1 of 2)
1
: except on the condition that : under any other circumstance than
2
: without the accompanying circumstance or condition that : but that : but
unless
prepositionDefinition of unless (Entry 2 of 2)
: except possibly : except
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Merriam-Webster unabridged
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Time Traveler for unless
The first known use of unless was in the 15th century
See more words from the same century