(mathematics, less common) Cartesian coordinates.

(geometry) The coordinates of a point measured from an origin along a horizontal axis from left to right (the x-axis) and along a vertical axis from bottom to top (the y-axis). This can be extended to three-dimensions by the z-axis perpendicular to the x- and y-axes.

(mathematics) The coordinates of a point in a plane, measured as its Cartesian distance from the origin and the angle measured anticlockwise/counterclockwise from the x-axis to a line joining the point to the origin.

(chemistry) A type of covalent bond where the two electrons being shared originate from the same atom; a dative bond.

(geometry, mathematical analysis) A method of representing the position of any individual point in a space of given dimensionality as a tuple of numerical coordinates.

(chemistry) Any of a class of compounds in which a central metal atom (normally a transition element) is surrounded by a group of ions or molecules (ligands).

(chemistry) The number of other atoms surrounding an atom in a molecule / (inorganic chemistry) The number of ligands surrounding a central metal atom in a coordination compound

(chemistry) the chemistry of coordination compounds

plural of coordinate axis

(mathematics, geometry) One of the lines in the coordinate system that represents one of the dimensions.