| boundary | | |
| n. (location) | 1. bound, boundary, bounds | the line or plane indicating the limit or extent of something. |
| ~ 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. |
| ~ edge, border | the boundary of a surface. |
| ~ end | a boundary marking the extremities of something.; "the end of town" |
| ~ extremity | the outermost or farthest region or point. |
| ~ demarcation, demarcation line, limit | the boundary of a specific area. |
| ~ lineation, outline | the line that appears to bound an object. |
| ~ 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. |
| ~ surface | the extended two-dimensional outer boundary of a three-dimensional object.; "they skimmed over the surface of the water"; "a brush small enough to clean every dental surface"; "the sun has no distinct surface" |
| ~ moho, mohorovicic discontinuity | the boundary between the Earth's crust and the underlying mantle.; "the Mohorovicic discontinuity averages 5 miles down under oceans and 20 miles down under continents" |
| ~ shoreline | a boundary line between land and water. |
| n. (shape) | 2. bound, boundary, edge | a line determining the limits of an area. |
| ~ line | a length (straight or curved) without breadth or thickness; the trace of a moving point. |
| ~ rim | the shape of a raised edge of a more or less circular object. |
| ~ margin, perimeter, border | the boundary line or the area immediately inside the boundary. |
| ~ fringe, outer boundary, periphery | the outside boundary or surface of something. |
| ~ brink, verge, threshold | 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. |
| n. (attribute) | 3. bound, boundary, limit | the greatest possible degree of something.; "what he did was beyond the bounds of acceptable behavior"; "to the limit of his ability" |
| ~ extent | the distance or area or volume over which something extends.; "the vast extent of the desert"; "an orchard of considerable extent" |
| ~ knife-edge | a narrow boundary.; "he lived on a knife-edge between genius and insanity" |
| ~ absoluteness, starkness, utterness | the quality of being complete or utter or extreme.; "the starkness of his contrast between justice and fairness was open to many objections" |
| ~ heat barrier, thermal barrier | a limit to high speed flight imposed by aerodynamic heating. |
| ~ level best, utmost, uttermost, maximum | the greatest possible degree.; "he tried his utmost" |
| ~ verge, brink | the limit beyond which something happens or changes.; "on the verge of tears"; "on the brink of bankruptcy" |
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