1. a pattern of following or observing a person in an obsessional, intrusive, or harassing manner. The pursued individual is typically a partner from a failed intimate relationship but may be a mental health care provider, a public figure (see erotic delusion), or other person of interest to the stalker. Stalking may involve direct threats, the intent to cause distress or bodily harm, and interpersonal violence. In the United States, laws against stalking vary from state to state. See also domestic violence; intimate partner violence.

2. in animal behavior, see predation. —stalk vb. —stalker n.