We report the results of a search for the decay K+-->pi(+)nu(nu) over bar in the kinematic region with pi(+) momentum 140pi(+)nu(nu) over bar. We also report improved limits on the rates of K+-->pi(+)X(0) and K+-->pi(+)X(1)X(2) where X-0,X-1,X-2 are hypothetical, massless, long-lived neutral particles.
