An Etymological Dictionary of Astronomy and Astrophysics

1. Any of a series of numbers which, in relation to a given → frame of reference, locate a point in space. See also:

→ astronomical coordinates→ canonical coordinates→ Cartesian coordinates→ celestial coordinates→ cylindrical coordinates→ equatorial coordinates→ Galactic coordinates→ generalized coordinates→ polar coordinates→ spherical coordinates→ precessed coordinates→ topocentric coordinates.

2. To place in the same order or rank; to organize in a concordant operation.

Etymology (EN): From L. co- “together,” → com-

• orinatus, p.p. of ordinare “to put in order, arrange,” from ordo “order.”

Etymology (PE): Hamârâ, from ham- “together,” → com- + ârâ stem of ârâstan “to arrange, to set in order, adorn,”
Mid.Pers. ârây-, ârâstan “to arrange, adorn,” O.Pers. râs- “to be right, straight, true,” râsta- “straight, true” (Mod.Pers. râst “straight, true”), râd- “to prepare,”
Av. râz- “to direct, put in line, set,” Av. razan- “order,” Gk. oregein “to stretch out,” L. regere “to lead straight, guide, rule,” p.p. rectus “right, straight,” Skt. rji- “to make straight or right, arrange, decorate,” PIE base *reg- “move in a straight line.”