Themelios

Themelios is a Greek word (θεμέλιος) meaning "foundation" or "fundamental." It is derived from the verb themelioō (θεμελιόω), meaning "to lay a foundation" or "to establish firmly."

The word is commonly used in theological and philosophical contexts to refer to the foundational principles or beliefs upon which a system of thought or practice is built. In Christian theology, for example, it might describe the core doctrines upon which the Christian faith rests, such as the deity of Christ, the atonement, and the authority of Scripture.

Themelios can also be used more broadly to refer to the underlying basis or justification for anything, such as a moral code, a political ideology, or a scientific theory. In this sense, it emphasizes the importance of having a solid and well-reasoned foundation for one's beliefs and actions.