sexual assault n.
1) Conduct of a sexual or indecent nature toward another person that is accompanied by actual or threatened physical force or that induces fear, shame, or mental suffering.
2) A statutory offense that provides that it is a crime to knowingly cause another person to engage in an unwanted sexual act by force or threat.
3) The crime of forcing another person to submit to sex acts, especially sexual intercourse.
4) The act of subjecting someone to unwanted or improper sexual advances or activity.
These are the textbook definitions. Does anyone care to elaborate?