The Oxford Thesaurus An A-Z Dictionary of Synonyms - ambiguity n.

1) equivocalness, equivocacy, amphibology or amphiboly; vagueness, indistinctness, uncertainty, indefiniteness, imprecision, inconclusiveness: Ambiguity of language must be avoided in legal documents. 2) equivocation, double-talk, double-speak, equivoque; pun, double entendre, amphibologism: The minister's speech was full of ambiguities.