An undetermined or unspecified thing: "We're all recalling something, furtively seeking something\u201d ( Virginia Woolf). An unspecified or undetermined amount or extent: We know something about the early settlers in this area. One having some or many of the same attributes, character, or essence as another: Trying to fix the computer myself was something of a mistake. A remarkable or important thing or person: He thinks he is something in that uniform. One who falls into a specified age range. Often used in combination: fortysomethings who attended their class reunion. Of, relating to, or being a member of a specified age range. Often used in combination: "the lives and loves of hip, twentysomething city dwellers\u201d ( Joseph P. Kahn). A little; somewhat: She looks something like her mother. Informal To an extreme degree: He drinks something fierce. something else Informal One that is very special or quite remarkable: Her new film is something else.