Co*ör"di*nate (?), *a.* [Pref.
*co-* + L. *ordinatus*, p. p. of *ordinare* to
regulate. See __Ordain__.] Equal in rank or order; not
subordinate.

Whether there was one Supreme Governor of the
world, or many *coördinate* powers presiding over each
country.

*Law.*

Conjunctions joint sentences and
*coördinate* terms.

*Rev. R. Morris.*

**Coördinate adjectives**, adjectives
disconnected as regards one another, but referring equally to the
same subject. -- **Coördinate
conjunctions**, conjunctions joining independent
propositions. *Rev. R. Morris.*

Co*ör"di*nate (-nāt), *v.
t.* [*imp. & p. p.*
__Coördinated__; *p. pr. & vb. n.*
__Coördinating__.] **1.** To make
coördinate; to put in the same order or rank; as, to
*coördinate* ideas in classification.

**2.** To give a common action, movement, or
condition to; to regulate and combine so as to produce harmonious
action; to adjust; to harmonize; as, to *coördinate*
muscular movements.

Co*ör"di*nate (?), *n.*
**1.** A thing of the same rank with another
thing; one two or more persons or things of equal rank,
authority, or importance.

It has neither *coördinate* nor
analogon; it is absolutely one.

*Coleridge.*

**2.** *pl.* *(Math.)* Lines, or
other elements of reference, by means of which the position of
any point, as of a curve, is defined with respect to certain
fixed lines, or planes, called *coördinate axes* and
*coördinate planes*. See __Abscissa__.
☞ *Coördinates* are of several kinds, consisting
in some of the different cases, of the following elements,
namely: *(a)* *(Geom. of Two Dimensions)* The
abscissa and ordinate of any point, taken together; as the
abscissa PY and ordinate PX of the point P (Fig. 2, referred to
the coördinate axes AY and AX. *(b)* Any
radius vector PA (Fig. 1), together with its angle of inclination
to a fixed line, APX, by which any point A in the same plane is
referred to that fixed line, and a fixed point in it, called the
*pole*, P. *(c)* *(Geom. of Three
Dimensions)* Any three lines, or distances, PB, PC, PD (Fig.
3), taken parallel to three coördinate axes, AX, AY, AZ, and
measured from the corresponding coördinate fixed planes,
YAZ, XAZ, XAY, to any point in space, P, whose position is
thereby determined with respect to these planes and axes.
*(d)* A radius vector, the angle which it makes
with a fixed plane, and the angle which its projection on the
plane makes with a fixed line line in the plane, by which means
any point in space at the free extremity of the radius vector is
referred to that fixed plane and fixed line, and a fixed point in
that line, the pole of the radius vector.

**Cartesian coördinates**. See under
__Cartesian__. -- **Geographical
coördinates**, the latitude and longitude of a
place, by which its relative situation on the globe is known. The
height of the above the sea level constitutes a third
coördinate. -- **Polar
coördinates**, coördinates made up of a
radius vector and its angle of inclination to another line, or a
line and plane; as those defined in *(b)* and
*(d)* above. -- **Rectangular
coördinates**, coördinates the axes of
which intersect at right angles. -- **Rectilinear
coördinates**, coördinates made up of right
lines. Those defined in *(a)* and
*(c)* above are called also *Cartesian
coördinates*. -- **Trigonometrical**
or **Spherical coördinates**, elements of
reference, by means of which the position of a point on the
surface of a sphere may be determined with respect to two great
circles of the sphere. -- **Trilinear
coördinates**, coördinates of a point in a
plane, consisting of the three ratios which the three distances
of the point from three fixed lines have one to another.