1. One or more non-transitory computer-readable media storing computer-executable instructions that, when executed, cause one or more processors to perform acts comprising: detecting an initial selection of a word being output by a touch-sensitive display and measuring a force of the initial selection on the touch-sensitive display; causing display of a first reference work entry associated with the word on the touch-sensitive display at least partly in response to the detecting of the initial selection; detecting a force on the touch-sensitive display that is greater or lesser than the measured force of the initial selection; and causing display of a second, different reference work entry associated with the word on the touch-sensitive display at least partly in response to the detecting of the greater or lesser force.
5. One or more non-transitory computer-readable media as recited in claim 1 , wherein the first and second reference work entries are both from a same category of reference work.