pri·mor·di·al 
(prī-môrdē-əl)
(prī-môrdē-əl)adj.
1. Being or happening first in sequence of time; original.
2. Primary or fundamental: play a primordial role.
3. Biology Belonging to or characteristic of the earliest stage of development of an organism or a part: primordial cells.
n.
A basic principle.
[Middle English, from Late Latin prīmōrdiālis, from Latin prīmōrdium, origin : prīmus, first; see per1 in the Appendix of Indo-European roots + ōrdīrī, to begin to weave; see ar- in the Appendix of Indo-European roots.]
pri·mordi·al·ly adv.