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| 1. |
boundary - the line or plane indicating the limit or extent of something |
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bound,
bounds |
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extremity an external body part that projects from the body; "it is important to keep the extremities warm"
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hairline the natural margin formed by hair on the head
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frontier an undeveloped field of study; a topic inviting research and development; "he worked at the frontier of brain science"
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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
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border,
borderline,
boundary line,
delimitation,
mete a strip forming the outer edge of something; "the rug had a wide blue border"
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bourn,
bourne an archaic term for a goal or destination
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district line the boundary between two districts
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county line the boundary between two counties
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city line the boundary of a city
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border,
edge a strip forming the outer edge of something; "the rug had a wide blue border"
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end (American football) a position on the line of scrimmage; "no one wanted to play end"
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demarcation,
demarcation line,
limit the greatest possible degree of something; "what he did was beyond the bounds of acceptable behavior"; "to the limit of his ability"
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lineation,
outline the act of marking or outlining with lines
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surface the outer boundary of an artifact or a material layer constituting or resembling such a boundary; "there is a special cleaner for these surfaces"; "the cloth had a pattern of red dots on a white surface"
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shoreline a boundary line between land and water
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| 2. |
boundary - a line determining the limits of an area |
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edge,
bound |
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line acting in conformity; "in line with"; "he got out of line"; "toe the line"
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rim the outer part of a wheel to which the tire is attached
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border,
margin,
perimeter a strip forming the outer edge of something; "the rug had a wide blue border"
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fringe,
outer boundary,
periphery an ornamental border consisting of short lengths of hanging threads or tassels
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brink,
threshold,
verge the edge of a steep place
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upper bound (mathematics) a number equal to or greater than any other number in a given set
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lower bound (mathematics) a number equal to or less than any other number in a given set
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thalweg a line following the lowest points of a valley
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