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A line that is a base for measurement or for construction.
(noun)
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A datum used as the basis for calculation or for comparison.
(noun)
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A line used as the basis for the alignment of glyphs.
(noun)
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The line at the farthest ends of the court indicating the boundary of the area of play.
(noun)
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A configuration of software, hardware, or a process that is established and documented as a point of reference.
(noun)
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