|Description: A. Characterization of singular objects or events instead of giving a name. As opposed to names descriptions are not rigid, i.e. they may refer to different objects in different worlds. - B. Linguistic form for attributing predicates according to the perceptions of objects. See also rigidity, theory of descriptions.|
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Description/modal reality/Lewis/Stalnaker: one describes modal reality by telling the parts from another - possible worlds differ from each other in many dimensions, so that there is a lot to say about it - this is nothing mystical.
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Identity/identification / Stalnaker: different descriptions: e.g. morning Star/Evening Star/Superman/ Clark Kent - not different: Cicero/Tully - who does not know that Cicero = Tully, yet can be a competent user of the name - he can also express beliefs about Tullius - he knows that Tullius refers to Tullius.
Ways a World may be Oxford New York 2003