  The content of a linguistic expression, at a context, determines a corresponding intension, which is a function from possible worlds (circumstances of evaluation, really) to extensions. For example, the content of ‘I’ with respect to the context \(c_1\) described above is Mary, and the extension of ‘I’ with respect to \(c_1\) and any world \(w\) whatsoever is Mary. The corresponding intension of ‘I’ with respect to \(c_1\) is the function whose value at any world \(w\) is the extension of ‘Mary’ with respect to \(c_1\) and \(w\), which is just Mary herself. The intension of ‘I’ varies from context to context, just as the content does; for instance, in context \(c_2\), the intension of ‘I’ is the function on worlds whose value at any world is John.