11. A mobile device comprising: means for receiving sensor data from at least one data source associated with the mobile device, wherein the at least one data source comprises one or more sensors of the mobile device; means for determining a first context class for the received sensor data, the first context class corresponding to a context state indicated by the received sensor data; means for determining that a confidence value associated with the determination of the first context class is below a threshold value; means for creating a fusion class for the received sensor data at least in part by fusing the first context class for the received sensor data and at least a second context class for the received sensor data, the at least the second context class being different from the first context class, wherein the fusion class semantically encompasses the first context class and the at least the second context class and further wherein the fusion class is broader than each of the first context class and the at least the second context class; means for substituting the fusion class for the first context class; and means for outputting the fusion class as an inferred context for the mobile device.
12. The mobile device of claim 11 wherein the at least one data source comprises one or more of an audio sensor, a transceiver, a motion sensor, a clock, a device usage sensor, a light sensor, a camera, or a calendar.