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
a mark showing the boundary of a piece of land
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"
the position of a prominent or well-known object in a particular landscape; "the church steeple provided a convenient landmark"
not characteristic of or befitting a profession or one engaged in a profession; "described in unprofessional language so that high school students could understand it"; "was censured for unprofessional conduct"; "unprofessional repairs"
occurring or encountered or experienced or observed frequently or in accordance with regular practice or procedure; "grew the usual vegetables"; "the usual summer heat"; "came at the usual time"; "the child's usual bedtime"