A lesbian is a woman who is emotionally, romantically, and/or sexually attracted to other women.
Sexual orientation refers to an individual's enduring pattern of emotional, romantic, and/or sexual attractions to men, women, both genders or none.
Heterosexual refers to individuals who are emotionally, romantically, and/or sexually attracted to members of the opposite sex.
Homosexuality refers to individuals who are emotionally, romantically, and/or sexually attracted to members of the same sex.