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https://scholar.google.com/scholar_case ... 0720422000

In this Goldman Sachs case, the defendant won because of the legal definition of the word "tangible" apparently from Black's Law Dictionary (its an oversimplification of what happened). Question is how does Black's Law Dictionary gets it definitions (from statuary law) AND what happens if some term is not in it ?

Black's is edited by Bryan Garner, who is a legal word legend (if there is such a thing). It's updated frequently, especially the online version. You can find articles where he talks about this. A case might turn on a Black's Law definition, sure. It's not a binding rule that what Black's says goes, but it's certainly persuasive, and, could become part of precedent over time in a certain jurisdiction.