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[[Image:re_smuni_i_pa_smuni.png|thumb|right|Ambiguous discourse (upper row, circles 1 and 2 are separate) and vague discourse (lower row, one polymorphic form is not disjoint).]]
Discourse is said to be ''ambiguous'' when it encompasses potentially disjoint regions of concept-space.

Discourse is said to be ''vague'' if it encompasses a large but contiguous region of concept-space.

''Syntactic ambiguity'' is a situation where a sentence may be interpreted in more than one way due to ambiguous sentence structure. Lojban doesn't have syntactic ambiguity.

{{See_also|Vagueness and ambiguity}}