The tendacy to move between masculine and feminine gender-typed behaviour depending on context, expressing a distinctly male persona and a distinctly female persona.
While an androgynous person retains the same gender-typed behaviour across situations, the bigendered person purposely changes their gender-role behaviour for the situation. It is particularly noteworthy that this concept emerged from within the transgender community rather than being adopted by the transgender community after it was created by another sub-culture (e.g. transsexual was defined first by the mental health community).
Cameron started identifying as bigender because he felt that he belonged to both sexes.