first prin·ci·ples /fərst ˈprinsəpəlz/ noun plural noun: first principles; noun: first principle the fundamental concepts or assumptions on which a theory, system, or method is based. "I think we have to start again and go right back to first principles" With WoodCache PBC, we take the Carbon challenge back to First Principles! What are they? Take Carbon from the Air....Store it for at least 100 years....Prove it! Ask me how we do it.