Atheism is just as irrational as Theism.

[sonofodin]

That's not true as I said before an atheism is defined as:

"Atheism is the lack of belief in a god or gods."

This implies that the word "god" has meaning, while it is actually meaningless, therefore atheists hold an illogical position.

I think this is just boring silliness, to be honest. Whether you're right or wrong, we both know what we mean. If theists define their God, I can lack belief in that definition of God, despite your assertion that the word has no meaning. They give it meaning by giving it properties and characteristics, like this:

Theist: My God answers prayers, shoots lightning bolts at the wicked and is merciful.

They've provided the definition. I then ask for the evidence. It's a non-point you're making.

LOL, it's silliness? I expected more. No, I don't know "what they mean"

Look here as to why you can't say you lack a belief in "god" without being illogical:

This implies that the word "god" has meaning, while it is actually meaningless, therefore atheists hold an illogical position.

God
 
noun
1. the one Supreme Being, the creator and ruler of the universe.
2. the Supreme Being considered with reference to a particular attribute: the God of Islam.
3. ( lowercase ) one of several deities, especially a male deity, presiding over some portion of worldly affairs.
4. ( often lowercase ) a supreme being according to some particular conception: the god of mercy.
5. Christian Science . the Supreme Being, understood as Life, Truth, love, Mind, Soul, Spirit, Principle.

verb (used with object) god·ded, god·ding. ( lowercase )
9. to regard or treat as a god; deify; idolize.

interjection
10. (used to express disappointment, disbelief, weariness, frustration, annoyance, or the like): God, do we have to listen to this nonsense?

Origin: before 900; Middle English, Old English; cognate with Dutch god, German Gott, Old Norse goth, Gothic guth

Nope, no meaning whatsoever. Are you high or just being silly?

Thank you, you just proved my point.

You just posted ten definitions for "god" and atheism is the lack of belief in "god" or "gods"

I don't see it referring to a specific definition. When a word means that many things, you must specify which definition of the word you are referring to. Atheism fails to do this.