Entry 1 sense Webster, 1913 Unambiguity · Un·am·bi·gu·i·ty · IPA /ˌʌn.æm.bɪˈɡjuː.ɪ.ti/ 01 n. Absence of ambiguity; clearness; perspicuity. 1. Absence of ambiguity; clearness; perspicuity.