Definitions for "Ensembles"
Musical performing groups; common Western ensembles include chorus, choir, men's chorus and women's chorus, orchestra, chamber group (such as string quartet), and band (concert, marching, jazz).
Reference to a set of computer models run under the concept of Ensemble Forecasting: multiple predictions from an ensemble of models with slightly different initial conditions used as input and/or slightly different versions of models. The objectives are to improve the accuracy of the forecast through averaging the various forecasts, which eliminates non-predictable components, and to provide reliable information on forecast uncertainties from the diversity amongst ensemble members. Forecasters use this tool to measure the likelihood of a forecast.