1. (a.) First in order; primary; original; of earliest origin; as, primordial condition.

2. (a.) of or pertaining to the lowest beds of the Silurian age, corresponding to the Acadian and Potsdam periods in American geology. It is called also Cambrian, and by many geologists is separated from the Silurian.

3. (a.) Originally or earliest formed in the growth of an individual or organ; as, a primordial leaf; a primordial cell.

4. (n.) A first principle or element.

aboriginal ancestral antepatriarchal atavistic autochthonous basal basic central crucial elemental elementary embryonic fundamental generative genetic germinal humanoid in embryo in ovo original patriarchal preadamite preglacial pregnant prehistoric prehuman primal primary prime primeval primitive primogenial primoprimitive pristine protogenic protohistoric protohuman radical rudimentary seminal