law of priority

law of pri·or·i·ty

use of the earliest published name (senior synonym) of two or more names of an organism as the correct name.
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A six-page introduction presents the concepts of scientific nomenclature, problems with translating Greek and Latin, taxonomic rules such as the Law of Priority, and brief biographies of a few of the earliest taxonomists, starting with Adam and Aristotle and ending with Wilson and Coues.