cardinality

noun
car·di·nal·i·ty | \ˌkär-də-ˈna-lə-tē \
plural cardinalities

Definition of cardinality 

: the number of elements in a given mathematical set

First Known Use of cardinality

1935, in the meaning defined above

History and Etymology for cardinality

cardinal entry 1 + -ity

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The first known use of cardinality was in 1935

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