You want the definition that is contrary to the historical, common usage and understanding of the term.
While it may be errant, it is what it is
Nit pick if you must. For all the superior intellect I hear about you would think y'all would have developed a work around to the vulgar (common) definition of the word to render it impotent to your position and philosophy.
It would be easier for you to simply state the approved, correct, or whatever, definition of gender.
Then move on.
Getting mad because people do not share your understanding of vocabulary only leads to bickering.
No minds will be changed, or considered for that matter.