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

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt
Someone who believes in science rather than a god or gods.

Note: This also excludes a belief in satan. Only satanists worship satan. Contrary to christian propaganda, atheists are happy, tolerant people and except in the cases of a religon being imposed upon them, they understand the diversity of beliefs, and conseal their distaste towards religon so as not to offend others.
1. Hey, you there, other atheist! Do you ever notice how we are so much happier than christians because we don't have to adhere to stupid, self contradictory rules, have Sunday morning to sleep-in, and have the knowlage that when we die, we loose all consious thought, and our bodies rot in a coffin.

2. Thankyou Mr. Atheist, without you, there'd be no TV, cars, computers, pornography or extra-warm socks because of how much christians hate science.

3. Wow, those christians sure seem angry at us atheists. Maybe its because our science has made their religon obsolete in filling the void of ignorance from thousands of years ago, and they are scared that they have based their whole lives around a fallacy, and that we are right and they are wrong.
by Anthr4x September 23, 2005

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt
A person who does not believe in a deity
I don't believe in God, Yahweh, Allah (all the same deity), Vishnu, Shiva, Brahma, or any other god or goddess. Therefore, I am an atheist.
by Walnut Obezyana October 08, 2006

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt
someone who does not believe in any gods. there are two kinds of atheists: strong atheists believe that the existence of gods are impossible, weak atheists (called agnostics) don't believe in god, but would start believing in him if he were proven true.

atheists usually come in two flavors: atheists who don't believe in god based on science, evolution, the big bang, humanism, skepticism and logic. the second group, unfortunately, are goths and vampires who don't believe in god because it's "alternative" and "anti-establishment".
Atheist: Gods are a logic fallacy
by Phil the Pill September 05, 2006

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt
A person who doesn't believe in God, which is fine by all counts. Far be it from anyone to criticize another's religious beliefs.

However, there exists a class of atheists who can't just sit still with their own beliefs and feel they have to attack others. It is pointless, however, to convince those of religion to put aside the beliefs, as it is for Atheists to take up religious beliefs.

Essentially, militant Atheists should shut up and let those of religion enjoy themselves, inasmuch that those of religion should stop proselytizing and let people form their own beliefs. What's the point in arguing about something that is impossible to prove?
Now it is such a bizarrely improbably coincidence that anything so mindbogglingly useful the Babel fish could have evolved by chance that some thinkers have chosen to see it as a final and clinching proof of the non-existence of God.
The argument goes something like this: “I refuse to prove that I exist,” says God, “for proof denies faith, and without faith I am nothing.”
“But,” says Man, “the Babel fish is a dead giveaway isn’t it? It could not have evolved by chance. It proves you exist, and so therefore, by your own arguments, you don’t. QED.”
“Oh dear,” says God, “I hadn’t thought of that,” and promptly vanishes in a puff of logic.
by Finklestein July 21, 2005

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt
A person who does not believe in a god. Nothing more, nothing less. It is the opposite of theist which is a person who believes in a supernatural being or deity.
Bob: Do you think god is real?
Rick: No, I am an atheist.
Bob: Oh, that's cool. Me too!
by aj00200 June 29, 2011

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt
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

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt