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.
Geo-engineering is a term which includes highly advanced forms of applied science and technologies, various newfangled chemical agents and synthetic materials, scientific bending of physical reality, as well as an assortment of reverse engineered modalities which are combined to produce specific outcomes.