something

American Heritage® Dictionary of the English Language, Fourth Edition

1. pro. An undetermined or unspecified thing: "We're all recalling something, furtively seeking something” ( Virginia Woolf).
2. pro. An unspecified or undetermined amount or extent: We know something about the early settlers in this area.
3. pro. 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.
4. n. A remarkable or important thing or person: He thinks he is something in that uniform.
5. n. One who falls into a specified age range. Often used in combination: fortysomethings who attended their class reunion.
6. adj. 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” ( Joseph P. Kahn).
7. adv. A little; somewhat: She looks something like her mother.
8. adv. Informal To an extreme degree: He drinks something fierce.
9. idiom. something else Informal One that is very special or quite remarkable: Her new film is something else.

Century Dictionary and Cyclopedia

1. n. Some thing; a certain thing indefinitely considered; a certain but as yet unknown, unspecified, or unexplained thing; an event, circumstance, action, or affair the nature or name of which has not as yet been determined, or is not now known, and cannot therefore be named or specified: as, something must have happened to detain him; I want to tell you something.
2. n. An actual thing; an entity: as, something or nothing.
3. n. A thing worthy of consideration; a person or thing of importance.
4. n. A part or portion more or less; an indefinite quantity or degree; a little.
5. In some measure or degree; somewhat; rather: a little.
6. At some distance.

Wiktionary

1. pro. An uncertain or unspecified thing; one thing.
2. pro. colloquial A quality to a moderate degree.
3. pro. colloquial, of a person A talent or quality that is difficult to specify.
4. pro. colloquial Somebody or something who is superlative in some way.
5. adj. Having a characteristic that the speaker cannot specify.
6. adv. degree somewhat; to a degree
7. adv. degree, colloquial To a high degree.
8. v. Applied to an action whose name is forgotten by, unknown or unimportant to the user, e.g. from words of a song.
9. n. An object whose nature is yet to be defined.
10. n. An object whose name is forgotten by, unknown or unimportant to the user, e.g., from words of a song. Also used to refer to an object earlier indefinitely referred to as 'something' (pronoun sense).

GNU Webster's 1913

1. n. Anything unknown, undetermined, or not specifically designated; a certain indefinite thing; an indeterminate or unknown event; an unspecified task, work, or thing.
2. n. A part; a portion, more or less; an indefinite quantity or degree; a little.
3. n. A person or thing importance.
4. adv. In some degree; somewhat; to some extent; at some distance.