In the United States the definition of sexual assault varies widely between the individual states. The Rape, Abuse & Incest National Network defines sexual assault as "unwanted sexual contact that stops short of rape or attempted rape. This includes sexual touching and fondling."
The National Center for Victims of Crime states that:
“ Sexual assault takes many forms including attacks such as rape or attempted rape, as well as any unwanted sexual contact or threats. Usually a sexual assault occurs when someone touches any part of another person's body in a sexual way, even through clothes, without that person's consent.