The term IT MEANS FOUR can be solved by the five-letter word TETRA. TETRA is derived from the Greek word for four, τέτταρες (tettares). It is commonly used in mathematics and science to refer to a group of four objects or entities. In chemistry, it is used to describe a molecule with four atoms or groups of atoms. In biology, it is used to describe a species with four members. In geology, it is used to describe a rock composed of four minerals. In technology, it is used to describe a system of four components.