The area covered by a given activity or subject. See Synonyms at range. The range of one's perceptions, thoughts, or actions. Breadth or opportunity to function. See Synonyms at room. The length or sweep of a mooring cable. Informal A viewing instrument such as a periscope, microscope, or telescope. Slang To examine or investigate. Often used with out: "Their World Wide Web site is, for now, the best place to scope out the future of the media business in cyberspace.\u201d ( Marc Gunther).