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The polarizations of the $\ensuremath{\Upsilon}(1S)$, $\ensuremath{\Upsilon}(2S)$, and $\ensuremath{\Upsilon}(3S)$ mesons are measured in proton-proton collisions at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$, using a data sample of $\ensuremath{\Upsilon}(nS)\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ decays collected by the CMS experiment, corresponding to an integrated luminosity of $4.9\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. The dimuon decay angular distributions are analyzed in three different polarization …