Plain English Meaning
A way of flying where the pilot looks outside to fly the airplane and stay clear of other traffic, clouds, and the ground. The weather has to be good enough to see clearly, and there are minimum visibility and cloud-clearance rules the pilot must follow.
Full Definition
A set of FAA regulations under which a pilot operates an aircraft primarily by outside visual reference to the horizon and surrounding terrain, in weather conditions clear enough to see and avoid other aircraft, terrain, and . requires meeting specified for visibility and , which vary by and .