Having only a single possible meaning, and therefore not susceptible to multiple conflicting interpretations. Clear and certain, without being obscure or vague.
(1) Not having two or more possible meanings. (2) Not susceptible to different interpretations. (3) Not obscure, not vague. (4) Clear, definite, certain.
having or exhibiting a single clearly defined meaning; "As a horror, apartheid...is absolutely unambiguous"- Mario Vargas Llosa