Someone who does not believe in a deity.
Person A: Hey! How come I didn't see you at church yesterday?
Person B: Oh, I'm done with church and the whole God thing. I've decided to become an Atheist.
by Chel H. February 16, 2008
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Let's end the stereotypes about atheists now.

I'm an atheist. Does this mean I love science? Not necessarily. I simply did not feel anything whatsoever going to church when I was little, and therefore, stopped believing. It was when I got older that the "Is realigion really plausible?" thoughts popped into my head.

Does it mean that I have faith in the government? Au contraire--I think the government and politicians and all that junk are mostly corrupt and stupid.

Do I hate other people for believing in God? Nope. In fact, I love diversity. The world would be boring as hell if we were all atheists.

Have I ever gone out of my way to convince a theist that what I believe is right? That's wrong too. I can't tell you for sure whether I'm right or wrong--it's not like a have proof or anything--so I don't bother with arguing over it. Unfortunately, a lot of theists don't pay me the same respect. :(

Am I evil? A theist may think so, but I don't. I love giving to charities, I participate in my school's choir, I love my family, and I don't smoke, drink excessively, or take sex lightly, I've never betrayed anyone, I get good grades, and I'm really nice to others.

I also have faith--not in a God, but in myself and those around me. I believe in living my life as happily as I can, since it is the only life I think I have to live. I don't constantly look to God to pull me through tough times; I pull myself through and make myself stronger.
"It is an interesting and demonstrable fact, that all children are atheists and were religion not inculcated into their minds, they would remain so" ~Ernestine Rose

"Atheism is a non-prophet organization" ~George Carlin
by Miss Logic May 05, 2006
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1. A person who does not believe in a deity or God.

(In extreme cases, it is also a person who criticizes others for believing "fairy tales" from the Bible. These people are not atheists, as they would have you think, but elitists, and should be given a severe beating.)
An Atheist does not go to Hell, because in his mind, there is no Hell.
by Dark Chaos July 29, 2004
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A person who doesn't believe in god. Someone who doesn't believe that there is a heaven or hell. Close to an agnostic, who doesn't believe that either (god or darwinism) can be proven or disproven.
Freedom of religion includes freedom from religion-No one should care if anyone is atheist or christian, everyone is entitled to their own beliefs
by me August 14, 2003
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One who denys on disbelives the existance of God.
Atheists are NOT the same as Wiccans.
by Oh Em Gee August 29, 2006
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A highly disputed term that can have any number of meanings.

The following are three colloquial definitions as understood and used by the average American:
1) Someone who believes that there is no God/Gods
2) That asshole who spends all of his time arguing with or scoffing at Christians about their beliefs.
3) A socially-depraved menace to society bent on burning our churches and brainwashing our children into joining their cult which is really based on worshiping Satan and may be headed by the Jews in their attempt to control the world's money and media in order to enslave us all... (I can go on)

But it's only fair to explain atheism as defined by atheists. After all, they are the ones who identify with the term. So what do THEY believe?

Generally, there are two strains of atheism, as used by atheists:
1. "Strong" atheism- The belief that there are no Gods
2. "Weak" atheism- The lack of belief in Gods

The vast majority of atheists fall into category 2. You're hard-pressed to find an atheist who is absolutely certain that there is no God.

There is a confusion about the terms "agnosticism" and "atheism" and it's important to make the distinction clear.

Agnosticism is a position concerning knowledge of Gods. Agnostics either:
1) believe that there is no way to know for certain whether or not there are Gods
2) are undecided on the issue because they currently lack sufficient evidence

Meanwhile, atheism/theism are positions concerning what you do and do not believe regardless of any claims to knowledge. Thus, fusions between the two are likely:

Agnostic atheist- I do not believe in any Gods because 1) or 2)
Agnostic theist- I believe despite 1) or 2) for any number of reasons (fear of hell, hope, comfort, feeling that there must be some great power/first cause, etc.)

Most self-proclaimed "agnostics" are also atheists. It's very common to hear someone who calls him/herself an agnostic say,
"I don't know whether or not there is a God, so I am neither a theist nor an atheist". But like the second strain of atheism, they do NOT have belief in any Gods. If they did believe, then they wouldn't be undecided! Thus, they are undecided and without belief (agnostic atheist). In much the same way, you can say that all infants and animals are also agnostic atheists!

Now, I say this is true for MOST self-proclaimed agnostics because I have yet to hear someone call him/herself an agnostic AND claim to believe in a God. This is because most self-proclaimed agnostics think of agnosticism as a third-choice between atheism and theism. I'm of the personal opinion that this is largely due to the many negative connotations surrounding the term "atheist" (see colloquial definitions above)

I apologize for the obscene length of this definition (inb4 tl;dr!), so I won't go into detail concerning this next point:
Atheism is NOT a religion. For the same reason, theism is also not a religion. You need more than mere belief/disbelief in a God(s) to be aptly identified as a religion.
Bob: Hey Fred!
Fred: Hey Bob!
Bob: You know, in all our many years of friendship, I've never asked you a simple question. Do you believe in God?
Fred: I'm an atheist-
*violence*
Bob: WRYYYYYYYYYYYYYYYYYYYY!!
by SpankyMuffin October 20, 2008
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1. Someone who isn't afraid of the concept that there might not be a life after death.

2. Someone who does not bow down to a deity that constantly threatens to burn you alive for not believing in a certain way after said deity created you to believe in an alternate way.

3. Someone who, throughout history, has been the source of ridicule and offensiveness. However, when said atheist ridicules a christian, jew, or muslim they are labeled as offensive and blasphemous.
Christian #1: Hey look it's John the Atheist, let's go make fun of him.

Christian #2: Nah, let's convert him instead.
by eggster215 December 29, 2010
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