The art of thinking · Language and meaning
Vagueness and ambiguity
Also known as: Vagueness, Ambiguity, Lexical ambiguity, Structural ambiguity
German: Vagheit und Mehrdeutigkeit
In philosophy of language and linguistics, an expression is vague when it has borderline cases to which it neither clearly applies nor clearly fails to apply, and ambiguous when it has two or more distinct meanings.
- Thinking models
- Philosophy
- Linguistics
In one sentence
Vague words have unclear borderline cases (“hot”); ambiguous words or sentences have several distinct meanings (“bank”).
Example
“Allow the motor to cool down sufficiently” is vague — how long is sufficient? “Remove the cover with the screws” is ambiguous — remove the screws too, or use the screws to remove it? Each needs a different fix.
How it applies
- Vagueness: Words such as “hot”, “tall”, “sufficient” or “regularly” have borderline cases. The sorites paradox (one grain is not a heap; adding one grain never makes a heap; so there are no heaps) shows that vagueness can’t be removed by small steps.
- Ambiguity: Lexical ambiguity lies in a word (“release” a lever or a software version); structural ambiguity in syntax (“check the valve with the gauge”). Context usually resolves ambiguity for a speaker, rarely for a reader in another situation.
- Different repairs: Vagueness is repaired by a threshold, a measurement or an example; ambiguity by choosing one meaning and rewording. Controlled languages restrict both: one word per meaning, approved terms with defined meanings.
- Technical documentation: Some vagueness is deliberate (“wear suitable protective gloves” where the type is specified elsewhere) and acceptable if the precise information exists where the reader needs it. Ambiguity in an instruction or warning is never acceptable.
Vagueness vs. generality
A general term covers many cases but has clear boundaries (“fastener”); a vague term has unclear boundaries. Generality is often the right choice in reusable content; vagueness rarely is.
How to read this pool
Entries, context cards and transitional topics
The art of thinking explains ways of thinking — where a method comes from, what it asks of you and how it was adapted later. You meet four kinds of content here, each with its own job:
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