primal

Adjective
  1. Serving as an essential component (synset 301280207)
    "a cardinal rule"; "the central cause of the problem"; "an example that was fundamental to the argument"; "computers are fundamental to modern industrial structure"
  2. Having existed from the beginning;
    In an earliest or original stage or state (synset 300817158)
    "aboriginal forests"; "primal eras before the appearance of life on earth"; "the forest primeval"; "primordial matter"; "primordial forms of life"

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