Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun set theory Of a set, the number of
elements it contains.  noun data modeling The property of a relationship between a
database table and another one, specifying whether it is onetoone, onetomany, manytoone, or manytomany.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 noun (mathematics) the number of elements in a set or group (considered as a property of that grouping)
Etymologies
from Wiktionary, Creative Commons Attribution/ShareAlike License
Examples

For example, it certainly depends on whether your set of trials is countably infinite or uncountably infinite (in other words the cardinality of your set of trials).

Thus, if you write card (N) = µ 0 (read: aleph sub zero), his theorems justified calling the cardinality of the “second number class” µ 1.

(Newman 1928, 144) To see how this socalled cardinality constraint applies to ramseyfications of theories, note that in Carnap's hands, the nonobservational part of reconstructed theories, their theoretical entities, were represented by “purely logicomathematical entities, e.g. natural numbers, classes of such, classes of classes, etc.”

At recess, one boy, Joshua, used a pointer to illustrate a math concept known as cardinality, by completing place settings on a whiteboard.

One boy, Joshua, used a pointer to illustrate a math concept known as cardinality, by completing place settings on a whiteboard.

At recess, one boy, Joshua, used a pointer to illustrate a math concept known as cardinality, by completing place settings on a whiteboard.

One boy, Joshua, used a pointer to illustrate a math concept known as cardinality, by completing place settings on a whiteboard.

One boy, Joshua, used a pointer to illustrate a math concept known as cardinality, by completing place settings on a whiteboard.

One boy, Joshua, used a pointer to illustrate a math concept known as cardinality, by completing place settings on a whiteboard.

One boy, Joshua, used a pointer to illustrate a math concept known as cardinality, by completing place settings on a whiteboard.
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