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Definition of Smithian
1. Adjective. of, pertaining to, or characteristic of a person bearing the surname Smith ¹
2. Adjective. (economics) of or characteristic of the theories of the political economist Adam Smith ¹
3. Adjective. (geology) of a regional geological stage of the Early Triassic epoch (249.7 – 247.4 Ma; preceded by the Dienerian and followed by the Spathian) ¹
¹ Source: wiktionary.com