Also see http://www.infidels.org/news/atheism/sn-definitions.html However, note deviation of OED definitions on the web-page with scans below, (which are from the OED 2nd Edition)

Atheism: Encyclopedia Britannica

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http://www.britannica.com/ebc/article?tocId=9356044&query=atheism&ct=

Critique and denial of metaphysical beliefs in God or divine beings.
Unlike agnosticism, which leaves open the question of whether there is a God, atheism is a positive denial. It is rooted in an array of philosophical systems. Ancient Greek philosophers such as Democritus and Epicurus argued for it in the context of materialism. In the 18th century David Hume and Immanuel Kant, though not atheists, argued against traditional proofs for God's existence, making belief a matter of faith alone. Atheists such as Ludwig Feuerbach held that God was a projection of human ideals and that recognizing this fiction made self-realization possible. Marxism exemplified modern materialism. Beginning with Friedrich Nietzsche, existentialist atheism proclaimed the death of God and the human freedom to determine value and meaning. Logical positivism holds that propositions concerning the existence or nonexistence of God are nonsensical or meaningless.

Atheism: 1911 Encyclopedia Britannica

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http://16.1911encyclopedia.org/A/AT/ATHEISM.htm (extensive article, OCD scanned with no proofreading)

Atheism: Merriam-Webster Dictionary

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http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=atheism&x=16&y=15

1 archaic : UNGODLINESS, WICKEDNESS
2 a: a disbelief in the existence of deity b: the doctrine that there is no deity

Atheism: Cambridge dictionary

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http://dictionary.cambridge.org/define.asp?key=4607&dict=CALD

someone who believes that God or gods do not exist

Atheism: The American Heritage Dictionary of the English Language

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http://www.bartleby.com/61/52/A0495200.html

1a. Disbelief in or denial of the existence of God or gods. b. The doctrine that there is no God or gods. 2. Godlessness; immorality.


Atheism: Webster's Revised Unabridged Dictionary, ©1996,1998 MICRA, Inc.

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http://dictionary.reference.com/search?q=atheism

The disbelief or denial of the existence of a God, or supreme intelligent Being.
Atheism is a ferocious system, that leaves nothing above us to excite awe, nor around us to awaken tenderness. --R. Hall.
Atheism and pantheism are often wrongly confounded. --Shipley.
2. Godlessness


Atheism: WordNet ® 2.0, © 2003 Princeton University

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http://dictionary.reference.com/search?q=atheism

1: the doctrine or belief that there is no God [syn: godlessness] [ant: theism]
2: a lack of belief in the existence of God or gods

Atheism: brainydictionary

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http://www.brainydictionary.com/words/at/atheism133232.html

(n.) The disbelief or denial of the existence of a God, or supreme intelligent Being.
(n.) Godlessness.

Atheist: thefreedictionary

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http://www.thefreedictionary.com/atheist

Someone who denies the existence of god.

Atheist: yourdictionary.com

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http://www.yourdictionary.com/ahd/a/a0495200.html

1. a. Disbelief in or denial of the existence of God or gods. b. The doctrine that there is no God or gods.
2. Godlessness; immorality.

Atheism: Compact Oxford English Dictionary

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http://www.askoxford.com/dictionaries/compact_oed/?view=uk

the belief that God does not exist.


Atheist: OED 2nd Edition, 1991

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File:OED-Atheist.gif

Disbelief: OED 2nd Edition, 1991

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File:OED-disbelief.gif