nothing

American Heritage® Dictionary of the English Language, Fourth Edition

1. pro. No thing; not anything: The box contained nothing. I've heard nothing about it.
2. pro. No part; no portion: Nothing remains of the old house but the cellar hole.
3. pro. One of no consequence, significance, or interest: The new nonsmoking policy is nothing to me.
4. n. Something that has no existence.
5. n. Something that has no quantitative value; zero: a score of two to nothing.
6. n. One that has no substance or importance; a nonentity: "A nothing is a dreadful thing to hold onto” ( Edna O'Brien).
7. adj. Insignificant or worthless: "the utterly nothing role of a wealthy suitor” ( Bosley Crowther).
8. adv. In no way or degree; not at all: She looks nothing like her sister.
9. idiom. for nothing Free of charge.
10. idiom. for nothing To no avail: all that trouble for nothing.
11. idiom. for nothing For no reason: fired him for nothing.
12. idiom. in nothing flat In very little time; very quickly.
13. idiom. nothing doing Informal Certainly not.

Century Dictionary and Cyclopedia

1. n. No thing; not anything; not something; something that is not anything. The conception of nothing is reached by reflecting that a noun, or name, in form, may fail to have any corresponding object; and nothing is the noun which by its very definition is of that sort.
2. n. A non-existent something, spoken of positively, so that the literal meaning is absurd.
3. n. Not something. In this sense the word is more distinctly no thing; and the sentence containing nothing merely contradicts a corresponding sentence containing something in place of nothing.
4. n. A cipher; naught.
5. n. A thing of no consequence, consideration, or importance; a trifle.
6. In no degree; not at all; in no way; not.

Wiktionary

1. pro. Not any thing; no thing.
2. pro. An absence of anything, including empty space, brightness, darkness, matter, or a vacuum.
3. pro. slang Anything
4. n. Something trifling, or of no consequence or importance
5. n. A trivial remark (especially in the term sweet nothings)
6. n. A nobody (insignificant person)
7. adv. archaic Not at all; in no way.

GNU Webster's 1913

1. n. Not anything; no thing (in the widest sense of the word thing); -- opposed to anything and something.
2. n. Nonexistence; nonentity; absence of being; nihility; nothingness.
3. n. A thing of no account, value, or note; something irrelevant and impertinent; something of comparative unimportance; utter insignificance; a trifle.
4. n. (Arith.) A cipher; naught.
5. adv. In no degree; not at all; in no wise.

WordNet 3.0

1. n. a quantity of no importance
2. adv. in no respect; to no degree