[en] The accuracy on the measurments of the Z⁰ width foreseen at LEP/SLC will be limited by the error on the normalization from the small angle luminosity monitors at the level of a few per cent. We show how the measurement of large angle e⁺e^- events produced near to the Z⁰ pole will enable a much more accurate measurement of Γ_z or Γ_ee/Γ_z to be made, as soon as the integrated luminosity is larger than ≅ 1 pb^-1. This measurement is free from most systematic errors affecting the other proposed techniques. Using this method, the expected ultimate relative accuracy on Γ_ee/Γ_z is ≅ 1.10^-3 (1.5.10^-2 neutrino families) after ≅ 10⁷ Z⁰. (orig.)