Expressing the highest or lowest degree of the quality, manner, etc., denoted by an adjective or an adverb. The superlative degree is formed from the positive by the use of -est, most, or least; as, highest, most pleasant, least bright.
the highest level or degree attainable; "his landscapes were deemed the acme of beauty"; "the artist's gifts are at their acme"; "at the height of her career"; "the peak of perfection"; "summer was at its peak"; "...catapulted Einstein to the pinnacle of fame"; "the summit of his ambition"; "so many highest superlatives achieved by man"; "at the top of his profession"
In grammar the superlative of an adjective or adverb is a form of adjective or adverb which indicates that something has some feature to a greater degree than anything it is being compared to in a given context. For example, if Adam is 45, Bess is 35, and Chris is 25, Adam is the oldest of the three, because his age transcends those of Bess and Chris in one direction, while Chris is the youngest, because his age transcends those of Adam and Bess in the other direction. If Dan, who is 50, and Edna, who is 20, join the group, Dan now becomes the oldest and Edna the youngest.