ETYM Latin primordialis, from primordium the first beginning; primus first + ordiri to begin a web, to begin: cf. French primordial.
1. First in order; primary; original; of earliest origin.
2. (Geology) 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. Originally or earliest formed in the growth of an individual or organ.
4. Pertaining to, or having existed from, beginning; in original form; first; primary.

Množina: primordial soups

A mixture of organic molecules in evolutionary theory from which life on earth originated