Can you persuade me from Agnostic to Atheist?

[Ben Davis]

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Some people try to discourage the atheism by defining the word in ways that make it hard to justify.  For instance, if you define an antheist as one having absolute certainty that no gods exist, or as one who would refuse to believe that gods exist even if compelling evidence for gods was produced, then you make atheism seem unreasonable and unattractive. 

When people use "antitheist" to mean "strong atheist" I assume they are doing a similar move, trying to make atheism unattractive by making it sound hostile. 

(Note that I'm not talking about your motives.  You seem reasonable.)

So I'm not going to use antitheism to mean strong atheism.  Should I avoid the word entirely, or does it have some useful meaning?  I hadda look it up. 

I went to dictionary.comm.  It offers only one definition:  "one opposed to belief in the existence of a god."  That's a useful word then.  It even describes me. 

But it doesn't describe all strong atheists. 

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So that's the reason and dictionary support for my position.

That's fair enough but it seems that dictionary.com has attempted to conflate all the usages of antitheism in to a single definition. There are fuller ones available (eg. OED, Websters) but the basis is this:

Theistic position: There is/are a god/s

A-theistic position: Absence of belief in a god/s

Anti-theistic position: There is/are no god/s

That's where I'm coming from but I acknowledge the definition you listed as an accurate one.
Modern usage has Antitheism encompassing opposition to religious practices and religions themselves even though not all religions are theistic. It's a broad word so there's value in understanding all usages.