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Definition:(noun) an anatomical structure used as a point of origin in locating other anatomical structures (as in surgery) or as point from which measurements can be taken(noun) a mark showing the boundary of a piece of land (noun) an event marking a unique or important historical change of course or one on which important developments depend; "the agreement was a watershed in the history of both nations" (noun) the position of a prominent or well-known object in a particular landscape; "the church steeple provided a convenient #######"
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