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Anenumerative definition of a concept or term is a special type ofextensional definition that gives an explicit and exhaustive listing of all theobjects that fall under the concept or term in question. Enumerative definitions are only possible for finite sets and only practical for relatively small sets.
An example of an enumerative definition for the set
extantmonotreme species
(for which theintensional definition is "species of currently-living mammals thatlay eggs") would be:
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