sex·u·al / ˈsekshoōəl/ • adj. 1. relating to the instincts, physiological processes, and activities connected with physical attraction or intimate physical contact between individuals: she had felt the thrill of a sexual attraction.2. of or relating to the two sexes or to gender: sensitivity about sexual stereotypes. ∎ of or characteristic of one sex or the other: the hormones which control the secondary sexual characteristics. ∎ Biol. being of one sex or the other; capable of sexual reproduction.DERIVATIVES: sex·u·al·ly adv.