Hm, yes. It refers to the supernatural existence that symbolizes the four major elements. That is what it is, as a word. But when I talk about it, it is a little bit different.
An artificial spirit that is the aggregate of each element's power. Those are the elementals that I command. Although they are something that surpass reality, they are not a phantasmal species. Earth, water, fire, wind, and ether. They are elemental pieces of the five great elements.
It can accumulate and pool magical energy together for use, and also applied for both defense and offense. For me, yes, they are also of use as materials for research and catalysts for ritual magic.
Well. Now, please have a look. The brilliance of the elements that make up this world... perhaps this mystery may one day lead us to the Root.