obsolete medical term sexual inversion inversione sessuale absolute inversion An outdated term in psychoanalysis referring to a "kind" of sexual inversion in which a gay person shows no erotic and/or sexual interest in persons of the "opposite" sex (i.e. a gay man showing no attraction toward women or a lesbian showing no attraction toward men); occasionally used to refer to gay persons having an aversion toward the "opposite" sex. The Complete Dictionary of Sexology