[fleetingmoments]

| Then more recently some academics have re-defined gender again to mean "ones own innate conception of one's male/female identity."

Nope. What you are talking about is Gender Identity. There is pretty good evidence for this being real and linked to prenatal testosterone exposure at certain periods in the womb, as with traits like digit ratio. Between cases like David Reimer's (a biological boy who was raised as a girl after a surgical accident as an infant, but whose gender identity stayed true to his birth sex - with tragic consequences) and the phenomenon of Androgen Insensitivity Syndrome (where genetically male XY are born with female-looking genitalia and raised as any other girl, but overwhelmingly continue to identify as women even after the condition is discovered in puberty), the existence of a gender identity that is separate from both chromosomal sex and social influence is not really in doubt.