 Ambiguity is important and it is worth examining what the phenomenon is and how it differs and relates to similar phenomena such as indexicality, polysemy, vagueness, and especially sense generality. While ‘is an uncle’ can be satisfied by both brothers of mothers and brothers of fathers, the phrase is not ambiguous but unspecified with respect to parent.  The boundaries of the predicate ‘is a heap’ is famously difficult to detect but the problem doesn’t seem to be that ‘heap’ enjoys too many meanings. The article will focus on what the phenomenon is and isn’t and discuss some of the interesting factors that confound the easy detection and categorization of apparent ambiguities.