Measurement of theBd0Bd0oscillation frequency using dimuon data inpp¯collisions ats=1.8 TeV

${B}_{d}^{0}\ensuremath{-}{B}_{d}^{0}$ oscillations are observed in ``self-tagged'' samples of partially reconstructed $B$ mesons decaying into a lepton and a charmed meson collected in $p\overline{p}$ collisions at $\sqrt{s}=1.8\mathrm{TeV}.$ A flavor tagging technique is employed which relies upon the correlation between the flavor of $B$ mesons and the charge of a nearby particle. We measure the flavor oscillation frequency to be $\ensuremath{\Delta}{m}_{d}{=0.471}_{\ensuremath{-}0.068}^{+0.078}\ifmmode\pm\else\textpm\fi{}0.034{\mathrm{ps}}^{\mathrm{\ensuremath{-}}1}.$ The tagging method is also demonstrated in exclusive samples of ${B}_{u}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{+}$ and ${B}_{d}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{*0}(892),$ where similar flavor-charge correlations are observed. The tagging characteristics of the various samples are compared with each other, and with Monte Carlo simulations.