An operational definition is generally designed to model a theoretical definition. The most operational definition is a process for identification of an object by distinguishing it from its background of empirical experience.
2 votes Vote for this answer. King of Metals. Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy. It is got without smelting; wherever it exists it is visible to the eye; and it consorts with little else than pure silver. Even with this precious alloy, the pure metal ranges from sixty to ninety-nine per cent.
If Synyster Gates were around in the 80's or early 90's, he'd be considered one of the greatest metal guitarists ever. Regardless of how you feel about A7X, Synyster is an absolutely unreal musician.