Truth-value Sometimes it is convenient to speak of the truth-value of a proposition (see for example speaker-relativity): The truth-value of a true proposition such as 'snow is white' is truth, and that of a false proposition such as 'snow is green' is falsity.

Vagueness An expression is vague if (i) its extension is indefinitely bounded, e.g. 'bald', 'tall' or (ii) in a given context it is unclear what is meant by it. In the first case the meaning of the term may be clear, but the extension is 'fuzzy' because there is no clear point at which things arranged on a single dimension (e.g. degree of baldness) cease to have the quality denoted by the term. In the second case particular uses of a term such as 'political' are vague: it may not be clear exactly what is meant by calling something political in a given context. Because of this, a word such as 'political' may be vague in both senses: because its meaning is vague, so is its extension.

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