We report the results of a search for ${\ensuremath{\nu}}_{e}$ appearance in a ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ beam in the MINOS long-baseline neutrino experiment. With an improved analysis and an increased exposure of $8.2\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on the NuMI targ...