"The 1984 edition of Webster's II New Riverside University Dictionary defines "enemy" simply as a "hostile force or power," "a member or unit of such a force," or "something having destructive effect"... Psychologists have long been aware that "hostile forces" and "destructive effect" are not always clear objective realities but are inextricably linked to the complex relationships between the participants in a conflict. Considering the role of perception, "enemy" can be defined as a person or a group of persons perceived to represent a threat to or to be hostile towards the perceiver."
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http://www.zurinstitute.com/enmity.html#definition
"The 1984 edition of Webster's II New Riverside University Dictionary defines "enemy" simply as a "hostile force or power," "a member or unit of such a force," or "something having destructive effect"... Psychologists have long been aware that "hostile forces" and "destructive effect" are not always clear objective realities but are inextricably linked to the complex relationships between the participants in a conflict. Considering the role of perception, "enemy" can be defined as a person or a group of persons perceived to represent a threat to or to be hostile towards the perceiver."