un·less

[uhn-les, uhn-]
conjunction
1.
except under the circumstances that: I'll be there at nine, unless the train is late.
preposition
2.
except; but; save: Nothing will come of it, unless disaster.

Origin:
1400–50; late ME prepositional phrase on less (also o less(e), earlier upon less) on a lesser footing or condition (than); first used as a preposition and conjunction in the early 16th century; see on, less

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Collins
World English Dictionary
unless (ʌnˈlɛs) [Click for IPA pronunciation guide]
 
conj
1.  (subordinating) except under the circumstances that; except on the condition that: they'll sell it unless he hears otherwise
 
prep
2.  rare except
 
[C14: onlesse, from onon + lesseless; compare French à moins que, literally: at less than]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Unless is always a great word to know.
So is zedonk. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
the offspring of a zebra and a donkey.
Etymonline
Word Origin & History

unless
1467, earlier onlesse (c.1440), from on lesse (than) "on a less condition (than)," the first syllable originally on, but the negative connotation and the lack of stress changed it to un-.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Unless you've been living in a cave, you probably haven't run across this new
  species of poisonous, nearly blind pseudoscorpion.
No ritual or routine to get things done is effective unless it's effective for
  you.
More zoos is differently not the solution, unless animals can place humans into
  zoos.
So unless you're a vegan, any one who talks about the suffering, you're quite
  the hypocrite.
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