noun. Red is an adjective to describe this ball. Red is an adjective to describe this ball. The definition of an adjective is a part of speech that is used to describe a noun. Red, tall, better and fast are all examples of adjectives.
Geo is defined as related to the Earth. An example of geo is geophone which is a device that detects seismic activity beneath the earth's surface. 1  earth, of the earth: geocentric, geophyte.  geographical: geopolitics.
geocentric. 1  having or representing the earth as a center: a geocentric theory of the universe. 2  using the earth or earthly life as the only basis of evaluation. 3  viewed or measured as from the center of the earth: the geocentric position of the moon.