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1.
The degree of "the quality of being dateable" that one possesses.

How attractive that person is to their desired sex.

i.e. How likely a third party would want to date that person.
<Matthew> Sure she's hot, but her high dateability is questionable when you start to know of her outlandish obsessions.

&

<CharlesLivingston> Listing "computing" as your main interests on Facebook negatively affects your dateability!
by Matthew1471 March 16, 2008