| border | | |
| n. (location) | 1. border, borderline, boundary line, delimitation, mete | a line that indicates a boundary. |
| ~ boundary, bounds, bound | the line or plane indicating the limit or extent of something. |
| ~ circumference, circuit | the boundary line encompassing an area or object.; "he had walked the full circumference of his land"; "a danger to all races over the whole circumference of the globe" |
| ~ fence line | a boundary line created by a fence. |
| ~ green line | the border marking the boundaries of the land that Israel won in its 1948 war of independence. |
| ~ line of control | a 450-mile line that is supposed to indicate the boundary between the part of Kashmir controlled by India and the part controlled by Pakistan. |
| ~ property line | the boundary line between two pieces of property. |
| ~ state boundary, state line | the boundary between two states. |
| n. (shape) | 2. border, margin, perimeter | the boundary line or the area immediately inside the boundary. |
| ~ lip | either the outer margin or the inner margin of the aperture of a gastropod's shell. |
| ~ bound, boundary, edge | a line determining the limits of an area. |
| n. (location) | 3. border, edge | the boundary of a surface. |
| ~ boundary, bounds, bound | the line or plane indicating the limit or extent of something. |
| ~ brink | the edge of a steep place. |
| ~ limb | (astronomy) the circumferential edge of the apparent disc of the sun or the moon or a planet. |
| n. (artifact) | 4. border, molding, moulding | a decorative recessed or relieved surface on an edge. |
| ~ edge | the outside limit of an object or area or surface; a place farthest away from the center of something.; "the edge of the leaf is wavy"; "she sat on the edge of the bed"; "the water's edge" |
| ~ picture frame | a framework in which a picture is mounted. |
| n. (artifact) | 5. border | a strip forming the outer edge of something.; "the rug had a wide blue border" |
| ~ edge | the outside limit of an object or area or surface; a place farthest away from the center of something.; "the edge of the leaf is wavy"; "she sat on the edge of the bed"; "the water's edge" |
| ~ edging | border consisting of anything placed on the edge to finish something (such as a fringe on clothing or on a rug). |
| ~ selvage, selvedge | border consisting of an ornamental fringe at either end of an oriental carpet. |
| ~ verge | a grass border along a road. |
| v. (contact) | 6. border, environ, ring, skirt, surround | extend on all sides of simultaneously; encircle.; "The forest surrounds my property" |
| ~ adjoin, contact, touch, meet | be in direct physical contact with; make contact.; "The two buildings touch"; "Their hands touched"; "The wire must not contact the metal cover"; "The surfaces contact at this point" |
| ~ fringe | decorate with or as if with a surrounding fringe.; "fur fringed the hem of the dress" |
| ~ gird, girdle | put a girdle on or around.; "gird your loins" |
| ~ cloister | surround with a cloister.; "cloister the garden" |
| ~ inclose, shut in, close in, enclose | surround completely.; "Darkness enclosed him"; "They closed in the porch with a fence" |
| ~ hem in | surround in a restrictive manner.; "The building was hemmed in by flowers" |
| ~ cloister | surround with a cloister, as of a garden. |
| v. (stative) | 7. border, bound | form the boundary of; be contiguous to. |
| ~ skirt | form the edge of. |
| ~ verge | border on; come close to.; "His behavior verges on the criminal" |
| ~ shore | serve as a shore to.; "The river was shored by trees" |
| ~ hold in, enclose, confine | close in.; "darkness enclosed him" |
| v. (contact) | 8. border, frame, frame in | enclose in or as if in a frame.; "frame a picture" |
| ~ inclose, shut in, close in, enclose | surround completely.; "Darkness enclosed him"; "They closed in the porch with a fence" |
| v. (possession) | 9. border, edge | provide with a border or edge.; "edge the tablecloth with embroidery" |
| ~ furnish, provide, supply, render | give something useful or necessary to.; "We provided the room with an electrical heater" |
| v. (contact) | 10. abut, adjoin, border, butt, butt against, butt on, edge, march | lie adjacent to another or share a boundary.; "Canada adjoins the U.S."; "England marches with Scotland" |
| ~ adjoin, contact, touch, meet | be in direct physical contact with; make contact.; "The two buildings touch"; "Their hands touched"; "The wire must not contact the metal cover"; "The surfaces contact at this point" |
| ~ neighbor, neighbour | be located near or adjacent to.; "Pakistan neighbors India" |
| borderline | | |
| adj. | 1. borderline, marginal | of questionable or minimal quality.; "borderline grades"; "marginal writing ability" |
| ~ minimal, minimum | the least possible.; "needed to enforce minimal standards"; "her grades were minimal"; "minimum wage"; "a minimal charge for the service" |
| 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" |
| delimit | | |
| v. (stative) | 1. define, delimit, delimitate, delineate, specify | determine the essential quality of. |
| ~ determine | fix in scope; fix the boundaries of.; "the tree determines the border of the property" |
| ~ be | have the quality of being; (copula, used with an adjective or a predicate noun).; "John is rich"; "This is not a good answer" |
| ~ redefine | give a new or different definition to.; "She redefined his duties" |
| v. (stative) | 2. delimit, subtend | be opposite to; of angles and sides, in geometry. |
| ~ be | have the quality of being; (copula, used with an adjective or a predicate noun).; "John is rich"; "This is not a good answer" |
| v. (cognition) | 3. delimit, delimitate, demarcate | set, mark, or draw the boundaries of something. |
| ~ circumscribe, confine, limit | restrict or confine,.; "I limit you to two visits to the pub a day" |
| demarcate | | |
| v. (cognition) | 1. demarcate | separate clearly, as if by boundaries. |
| ~ differentiate, distinguish, secern, secernate, severalise, severalize, tell apart, separate, tell | mark as different.; "We distinguish several kinds of maple" |
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