Prime

adjective

1. first in rank, authority, or significance : principal
2. having the highest quality or value
3. of the highest grade regularly marketed
4. first in time : original
5. of, relating to, or being a prime number compare relatively prime
6. having no polynomial factors other than itself and no monomial factors other than 1
7. expressed as a product of prime factors (such as prime numbers and prime polynomials)
8. not deriving from something else : primary