Measurements of Partial Branching Fractions for B[over ¯]→X_{u}lν[over ¯] and Determination of |V_{ub}|

We present partial branching fractions for inclusive charmless semileptonic B decays (B) over bar -> X(u)l (nu) over bar, and the determination of the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-ub vertical bar. The analysis is based on a sample of 383 x 10(6) gamma(4S) decays into B (B) over bar pairs collected with the BABAR detector at the SLAC PEP-II e(+)e(-) storage rings. We select events using the invariant mass M-X of the hadronic system, the invariant mass squared, q(2), of the lepton and neutrino pair, the kinematic variable P+, or one of their combinations. We then determine partial branching fractions in limited regions of phase space: Delta B = (1.18 +/- 0.09(stat) +/- 0.07(syst) +/- 0.01(theor)) x 10(-3) (M-X <1.55 GeV/c(2)), Delta B = (0.95 +/- 0.10(stat) +/- 0.08(syst) +/- 0.01(theor)) x 10(-3) (P+ <0.66 GeV/c), and Delta B = (0.81 +/- 0.08(stat) +/- 0.07(syst) +/- 0.02(theor)) x 10(-3) (M-X <1.7 GeV/c(2), q(2) > 8 GeV2/c(4)). Corresponding values of vertical bar V-ub vertical bar are extracted using several theoretical calculations.