Usually rectangular coordinates. either of two Cartesian coordinates in which the axes meet at right angles.
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- rectal sinus,
- rectangular coordinates,
- rectangular hyperbola,
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the Cartesian coordinates in a system of mutually perpendicular axes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012