countable

[koun-tuh-buhl]

count·a·ble

[koun-tuh-buhl]
adjective
1.
able to be counted.
2.
Mathematics.
a.
(of a set) having a finite number of elements.
b.
(of a set) having elements that form a one-to-one correspondence with the natural numbers; denumerable; enumerable.

Origin:
1400–50; late Middle English. See count1, -able

count·a·bil·i·ty, count·a·ble·ness, noun
count·a·bly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Countable is always a great word to know.
So is rounding. Does it mean:
a statement that two quantities are equal; an equation
the process of replacing a number by another number of approximately the same value but having fewer digits
Collins
World English Dictionary
countable (ˈkaʊntəbəl)
 
adj
1.  capable of being counted
2.  maths, logic able to be counted using the natural numbers; finite or denumerable
3.  linguistics denoting a count noun

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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FOLDOC
Computing Dictionary

countable definition

mathematics
A term describing a set which is isomorphic to a subet of the natural numbers. A countable set has "countably many" elements. If the isomorphism is stated explicitly then the set is called "a counted set" or "an enumeration".
Examples of countable sets are any finite set, the natural numbers, integers, and rational numbers. The real numbers and complex numbers are not [proof?].
(1999-08-29)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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