We have calculated the 0(&agr;s) corrections to the gluonic width of &Ugr;‐like mesons in QCD. We obtain &Ggr;g=&Ggr;0g[1+(3.8±0.5) &agr;s(M&Ugr;)/&pgr;] in the M¯S¯ scheme renormalized at M&Ugr;. With this correction, the measured value of the leptonic branching ratio of the &Ugr; implies that &Lgr;M¯S¯=100 MeV, with experimental errors of+34−25MeV and comparable theoretical uncertainties. A similar analysis of the &psgr; and &psgr;′ data is consistent with this value of &Lgr;M¯S¯. We also present 0(&agr;s) corrections to other quantities in quarkonium decay.