not ambiguous, or unclear; distinct; unequivocal: The object of the experiment was to reach an unambiguous conclusion about climate change.

un-1 + ambiguous

unambiguously, adverb
unambiguousness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unambiguous (ˌʌnæmˈbɪɡjʊəs)
not ambiguous; clear: an unambiguous message

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1751, from un- (1) "not" + ambiguous. Related: Unambiguously.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The laser flash should give a clear and unambiguous signal to stop.
Boom mic is removable and pleasingly flexible, perfect for flinging clear and
  unambiguous insults at your enemies.
It's not as clear-cut and unambiguous as averaging accident rates per distance
The necessity of conducting an unambiguous recount became clear in the last
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