1. An avionics system, comprising: a) a dynamic grammar definition subsystem configured to receive and analyze dynamic, current aircraft state data and provide an enhanced set of recognizable current, varying grammar data based on said aircraft state data; and, b) a voice recognition subsystem configured to receive said current, varying grammar data from said dynamic grammar definition subsystem and utilize said current, varying grammar data to provide a reduced set of commands in response to a user's voice input based on the aircraft's dynamic, current state.