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primordial

pri·mor·di·al [ prī máwrdee əl ]


adjective 
Definition:
 
1. existing first: existing at the beginning of time or of the development of something

2. basic: essential or basic to something

3. biology of earliest stage of development: relating to cells, tissues, organs, or organisms at the earliest stage of development

[14th century. < late Latin primordialis< Latin primordium "origin" < primus "first" + ordiri "begin"]
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