boundary

Noun
  1. is a type of: extremity - the outermost or farthest region or point
    subtypes:
    • hairline - the natural margin formed by hair on the head
    • frontier - an international boundary or the area (often fortified) immediately inside the boundary
    • heliopause - the boundary marking the edge of the sun's influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind from the sun and the radiation from other stars meet
    • border, borderline, boundary line, delimitation, mete - a line that indicates a boundary
    • bourn, bourne - an archaic term for a boundary
    • district line - the boundary between two districts
    • county line - the boundary between two counties
    • city line - the boundary of a city
    • border, edge - the boundary of a surface
    • end - a boundary marking the extremities of something
    • demarcation, demarcation line, limit - the boundary of a specific area
    • lineation, outline - the line that appears to bound an object
    • surface - the extended two-dimensional outer boundary of a three-dimensional object
    • shoreline - a boundary line between land and water
    specific instances:
    • rubicon - the boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war
    • moho, mohorovicic discontinuity - the boundary between the Earth's crust and the underlying mantle
    same as: bound, bounds
  2. is a type of: line - a length (straight or curved) without breadth or thickness; the trace of a moving point
    subtypes:
    • rim - the shape of a raised edge of a more or less circular object
    • border, margin, perimeter - the boundary line or the area immediately inside the boundary
    • fringe, outer boundary, periphery - the outside boundary or surface of something
    • brink, threshold, verge - a region marking a boundary
    • upper bound - (mathematics) a number equal to or greater than any other number in a given set
    • lower bound - (mathematics) a number equal to or less than any other number in a given set
    • thalweg - the middle of the chief navigable channel of a waterway that forms the boundary line between states
    same as: bound, edge
  3. is a type of: extent - the distance or area or volume over which something extends
    subtypes:
    same as: bound, limit

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