Definiendum and Definiens
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
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The definiendum is the term being defined; the definiens is the wording that does the defining.
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"'Bachelor' means unmarried adult male." Definiendum: bachelor. Definiens: the rest.
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The definiens is words about words — that's why definitions can be evaluated at all.