no

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adverb Used to express refusal, denial, disbelief, emphasis, or disagreement.
• adverb Not at all; not by any degree. Often used with the comparative.
• adverb Not.
• adverb Informal Used to indicate agreement with a preceding statement, especially when followed by a stronger judgment supporting that statement.
• noun A negative response; a denial or refusal.
• noun A negative vote or voter.
• interjection Used to express strong refusal, doubt, or disbelief.
• adjective Not any; not one; not a.
• adjective Not at all; not close to being.
• adjective Hardly any.

from The Century Dictionary.

• noun A denial; the word of denial.
• noun A negative vote, or a person who votes in the negative: as, the noes have it.
• Not any; not one; none.
• No is used, like not in similar constructions, with a word of depreciation or diminution, to denote a certain degree of excellence, small or great according to circumstances.
• Not in any degree; not at all; in no respect; not: used with a comparative: as, no longer: no shorter; no more; wo less.
• An abbreviation of the Latin numero, ablative of numerus, number: used for English number, and so as a plural Nos.: as, No. 2, and Nos, 9 and 10.
• Nor.
• noun In Japan, a sort of dignified operatic performance consisting of music and dancing, with recitation. The carved masks worn by the performers indicate the characters portrayed.
• An abbreviation of not otherwise provided for.
• Not ever; never; not at all; not.
• Not so; nay; not: with implied, but not expressed, repetition of a preceding (or succeeding) statement denied or question answered in the negative, with change of person if necessary.
• In answer to a request (expressed or anticipated): in this use often repeated for emphasis: as, no, no, do not ask me.
• Used parenthetically in iteration of another negative.
• Used continuatively, in iteration and amplification of a previous negative, expressed or understood.
• Not: used after or, at the end of a sentence or clause, as the representative of an independent negative sentence or clause, the first clause being often introduced by whether or if: as, he is uncertain whether to accept it or no; he may take it or no, as he pleases.
• See no. adverb
• noun An abbreviation
• noun of northern
• noun In chem., the symbol for noriurn.

from the GNU version of the Collaborative International Dictionary of English.

• noun A refusal by use of the word no; a denial.
• noun A negative vote; one who votes in the negative
• noun abbreviated Number; -- the number designating place in an ordered sequence.
• adverb Nay; not; not at all; not in any respect or degree; -- a word expressing negation, denial, or refusal. Before or after another negative, no is emphatic.
• adjective Not any; not one; none; ; -- often used as a quantifier.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• determiner Not any.
• determiner Not any possibility or allowance of (doing something).
• determiner Not (a); not properly, not really; not fully.
• adverb Not.
• adverb Not any, not at all.
• preposition Used to show disagreement or negation.
• preposition Used to show agreement with a negative question.
• noun A negating expression; an answer that shows disagreement or disapproval.
• noun A vote not in favor, or opposing a proposition.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the number designating place in an ordered sequence
• adverb referring to the degree to which a certain quality is present
• adjective quantifier; used with either mass nouns or plural count nouns for indicating a complete or almost complete lack or zero quantity of
• adverb used to express refusal or denial or disagreement etc or especially to emphasize a negative statement
• adverb not in any degree or manner; not at all
• noun a radioactive transuranic element synthesized by bombarding curium with carbon ions; 7 isotopes are known
• noun a negative