Ambiguity

Ambiguity is the phenomenon that an expression has more than one meaning.

Comments
Two different types of ambiguity can be distinguished on the basis of what is causing it: lexical ambiguity (more than one word meaning) and structural ambiguity (more than one syntactic structure).

Ambiguity has to be distinguished from vagueness and context dependence.

Link
Utrecht Lexicon of Linguistics

Other languages

 * French ambiguité
 * German Ambiguität
 * Russian неоднозначность