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Truth condition

In semantics, truth conditions are that which obtain precisely when a sentence is . For example, "It is snowing in Nebraska" is true precisely when it is snowing in Nebraska.

More formally, we can think of a truth condition as what makes for the truth of a sentence in an inductive definition of truth (for details, see the semantic theory of truth). Understood this way, truth conditions are theoretical entities. To illustrate with an example: suppose that, in a particular truth theory, the word "Nixon" refers to Richard M. Nixon, and "is alive" is associated with the set of currently living things. Then one way of representing the truth condition of "Nixon is alive" is as the ordered pair <Nixon, {x: x is alive}>. And we say that "Nixon is alive" is true if and only if the referent (or referent of) "Nixon" belongs to the set associated with "is alive", that is, if and only if Nixon is alive.

In semantics, the truth condition of a sentence is almost universally considered to be distinct from its meaning. The meaning of a sentence is conveyed if the truth conditions for the sentence are understood. Additionally, there are many sentences that are understood although their truth condition is uncertain. One popular argument for this view is that some sentences are necessarily true — that is, they are true whatever happens to obtain. All such sentences have the same truth conditions, but arguably do not thereby have the same meaning. Likewise, the sets {x: x is Alice and then we have} and {x: x is alive and x is not a rock} are identical — they have precisely the same members — but presumably the sentences "Nixon is alive" and "Nixon is alive and is not a rock" have different meanings.



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