What does it mean for a vulnerability to be retired?

[Terra Frost <terrafrost () gmail com>]

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<http://www.securityfocus.com/bid/26885> is an example of a
vulnerability whose status has been changed to RETIRED.  My question
is..  what, exactly, does that mean?

My guess is that it means that the vulnerability is bogus.  But why,
then, say it's RETIRED and not BOGUS?  It's hard to misinterpret BOGUS,
but rather easy to misinterpret RETIRED.

Further, if that is indeed what RETIRED means, why would the above
report, under "Vulnerable", say "WordPress", when, in fact, it isn't?
Maybe, if anything, it should say WordPress and then have a
strikethrough through it?
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