superlative

The extreme (e.g. highest, lowest, deepest, farthest, etc) extent or degree of something.

The degree of comparison of an adjective or adverb used when comparing three or more entities in terms of a certain property or a certain way of doing something. In English, the superlative of superiority is formed by adding the suffix -est or the word most (e.g. tiniest, most fully); the superlative of inferiority, by adding the word least (e.g. least big, least fully).