Again the Rejection of belief is a notable and referenced definition which is not addressed at all by your rewrite The rejection definition is commonly used as an expansion of the first definition The first definition of the current lede is sometimes given emphasis within the second definition For instance disbelief and denial are used separately in definitions but are occasionally together as in Disbelief or denial in the existence of a supreme being or beings Disbelief as I alluded to earlier can have different connotations meaning either to believe something is false to doubt something is true or to reject belief for any number of reasons without necessarily believing the expert s jargon to be false As JimWae pointed out sometime ago disbelief rarely if ever means the absence of belief of an innocent Thus both the first and second definitions are notable and are usually separate from the absence definition I also don t see that there is a particular need to bloat the less common broadest definition with these particulars when it should be clear that all atheists have an absence of belief in deities