Etymology
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unambiguous (adj.)

1630s, from un- (1) "not" + ambiguous. Related: Unambiguously; unambiguousness.

updated on February 25, 2014

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Definitions of unambiguous from WordNet

unambiguous (adj.)
having or exhibiting a single clearly defined meaning; "As a horror, apartheid...is absolutely unambiguous"- Mario Vargas Llosa;
unambiguous (adj.)
admitting of no doubt or misunderstanding; having only one meaning or interpretation and leading to only one conclusion;
Synonyms: unequivocal / univocal
From wordnet.princeton.edu, not affiliated with etymonline.