(noun) the line or plane indicating the limit or extent of something. Synonyms: bound, bounds.
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Noun Definition 1
(noun) a line determining the limits of an area. Synonyms: edge, bound.
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Noun Definition 2
(noun) the greatest possible degree of something. Synonyms: limit, bound. Examples: "What he did was beyond the bounds of acceptable behavior." "To the limit of his ability."