meridian

As a noun meridian

is an imaginary great circle on the Earth's surface, passing through the geographic poles.

As an adjective meridian

is meridional; relating to a meridian.

As a proper noun Meridian

is a CDP in Colorado.

As an adverb meridionally is

in a meridional manner.

In astronomy terms the difference between meridian and colure

is that meridian is a great circle passing through the poles of the celestial sphere and the zenith for a particular observer while colure is either of two great circles (meridians) that intersect at the poles and either the equinoxes or solstices.

As nouns the difference between meridian and colure

is that meridian is an imaginary great circle on the Earth's surface, passing through the geographic poles while colure is either of two great circles (meridians) that intersect at the poles and either the equinoxes or solstices.

As an adjective meridian

is meridional; relating to a meridian.

As a proper noun Meridian

is a CDP in Colorado.

In astronomy terms the difference between meridian and circummeridian

is that meridian is a great circle passing through the poles of the celestial sphere and the zenith for a particular observer while circummeridian is about or around the meridian.

As adjectives the difference between meridian and circummeridian

is that meridian is meridional; relating to a meridian while circummeridian is about or around the meridian.

As a noun meridian

is an imaginary great circle on the Earth's surface, passing through the geographic poles.

As a proper noun Meridian

is a CDP in Colorado.